A true Christian is not a person who is or considers him/her self to be morally superior. The opposite is true. He/she acknowledges failure to live in accordance with God's moral requirements and sincerely relies on God's provision in this respect through Jesus Christ. As Paul the Apostle put it
1Ti 1:15 This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief.
God is not limited by time or space. He is eternal. A concept beyond our understanding in our present "Living Soul" state.
In the beginning God created the Heavens and the Earth, i.e. the Universe, and every thing and animal in it. The first man, Adam, became a Living Soul.
Gen 1:1 In the beginning God created the heaven and the earth.
Gen_2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
Ecc 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
("Soul" equates to "Spirit" not the Holy Spirit/God's Spirit. It is our eternal Spiritual "Being" ) Thus God created a human body as a temporary (lifetime) habitation for a spirit (such spirit being our real, eternal, being)
Gen_1:27 So God created man in his own image, in the image of God created he him; male and female created he them.
"image" clearly means "reflection of characteristics" not exact physical likeness, since God is Spirit.
However, humans are inherently "Sinful" i.e. Disobedient to God.
This is clear from our normal experiences. From a very early age children naturally and deliberately disobey their parents and only gradually learn that obedience brings rewards and disobedience results in loss or pain - psychological, emotional or physical. When older they often reject instruction in order to "do it their way". Likewise, adults prefer to do things their way if they are impatient or dissatisfied with events and are inherently self seeking.
Sin entered into mankind through Adam and Eve falling for Satan's lie and disobeying God's precise command, resulting in mankind being separated from God and thereby subject to eternal "Death"..
Gen 3:2 And the woman said unto the serpent, We may eat of the fruit of the trees of the garden:
Gen 3:3 But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die.
Gen 3:4 And the serpent said unto the woman, Ye shall not surely die:
Gen 3:5 For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil.
Gen 3:6 And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
Gen 3:7 And the eyes of them both were opened, and they knew that they were naked; and they sewed fig leaves together, and made themselves aprons.
I can see nothing in Scripture which supports the view that God intended Mankind to physically live forever and had his plan frustrated by Satan but there was a Tree of Life in the Garden of Eden
Gen 3:22 And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
but we are not told if God would have allowed Adam and Eve to eat thereof had they not sinned, although it might be argued that if the Tree of Knowledge was placed in the Garden by God it was His intention that man would, eventually, be permitted to participate thereof, but that is conjecture.
Whether we like it or not, the clear teaching of Scripture is that there are two distinct classes of people in this World. Gods children and those of the Devil.
Mat 13:24 Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field:
Mat 13:25 But while men slept, his enemy came and sowed tares among the wheat, and went his way.
Mat 13:26 But when the blade was sprung up, and brought forth fruit, then appeared the tares also.
Mat 13:27 So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?
Mat 13:28 He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
Mat 13:29 But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.
Mat 13:30 Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
and
Joh 8:39 They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.
Joh 8:40 But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.
Joh 8:41 Ye do the deeds of your father. Then said they to him, We be not born of fornication; we have one Father, even God.
Joh 8:42 Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me.
Joh 8:43 Why do ye not understand my speech? even because ye cannot hear my word.
Joh 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
If we find this offensive in that Gods appears to lack mercy in not granting every human automatic, salvation, all. I can say is that in the end when all truth is known, God will be shown to be fully merciful, loving, righteous and just. As Paul puts it
Rom 3:4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.
Meanwhile, he has given us His word, both written and living (Jesus) which he expects us to follow in complete faith
This "Fall", foreseen by God, required God to make provision for man's fellowship with God to be restored. That provision was only provided by the substitutional sacrifice of Jesus, which became the source of salvation for those born before and after the event. Initially, God dealt directly with individual people, through visions and dreams
Num 12:6 And he said, Hear now my words: If there be a prophet among you, I the LORD will make myself known unto him in a vision, and will speak unto him in a dream.
Num 12:7 My servant Moses is not so, who is faithful in all mine house.
Num 12:8 With him will I speak mouth to mouth, even apparently, and not in dark speeches; and the similitude of the LORD shall he behold: wherefore then were ye not afraid to speak against my servant Moses?
and God made a direct covenant with Abraham (basically that Abraham would become the founder of a large nation. )
Gen 12:1 Now the LORD had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee:
Gen 12:2 And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
Gen 12:3 And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.
There were then two Covenants instituted by God for the benefit of the descendants of Abraham. Both covenants required true belief in God's promise and had provision for foreigners ("Strangers") to participate therein. Under the First Covenant, directed at the physical descendants of Abraham, sacrifices of specified animals were required, initially not specifically set out in Scripture but clearly known throughout the Earth from the earliest days (passed on through Adam's/Noah's descendants) until fully detailed instructions were given through Moses thousands of years later. It was repeatedly stated that this covenant would be replaced by a new covenant implemented through a "Messiah" and "written in the heart"
Jer 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
Jer 31:34 And they shall teach no more every man his neighbor, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Job in about 1300 BC was clearly aware of the coming Messiah - the "Christ" (anointed one).
Job 19:25 For I know that my redeemer liveth, and that he shall stand at the latter day upon the earth:
and
Isa 53:1 Who hath believed our report? and to whom is the arm of the LORD revealed?
Isa 53:2 For he shall grow up before him as a tender plant, and as a root out of a dry ground: he hath no form nor comeliness; and when we shall see him, there is no beauty that we should desire him.
Isa 53:3 He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not.
Isa 53:4 Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted.
Isa 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.
Isa 53:6 All we like sheep have gone astray; we have turned every one to his own way; and the LORD hath laid on him the iniquity of us all.
Isa 53:7 He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth.
Isa 53:8 He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken.
Isa 53:9 And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth.
Isa 53:10 Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand.
Isa 53:11 He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities.
Isa 53:12 Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death: and he was numbered with the transgressors; and he bare the sin of many, and made intercession for the transgressors.
The constant requirement for a person to benefit from/participate in the various covenants is genuine belief and trust in God. The opportunity for such belief is generated and orchestrated by God but for a person to benefit therefrom, he/she must always freely and willingly accept that opportunity.
Rom_4:3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
Gal_3:6 Even as Abraham believed God, and it was accounted to him for righteousness.
Jas_2:23 And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.
lJoh_6:37 All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.
Joh_6:39 And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the
Joh_6:40 For my Father's will is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise them up at the last day.". NIV
Joh_6:44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.
Note: Jesus is the living Word of God
(Joh 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.
therefore "Eating my flesh" means absorbing The Word. "Drinking my blood" means relying on Jesus' sacrifice (shed blood) for our salvation.
Such true belief cannot be lost or forfeited.