The key words with respect to God's salvation of human beings are: "through faith in Christ", because we are ALL descended from Adam:
John 3:16-19: "For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God."
John 3:20-21: "And this is the condemnation, that the light is come into the world, and men loved darkness rather than the light, because their deeds were evil.
(For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.)"
What Jesus said above, implies choice on the part of individual human beings, and it goes back to what Adam did in the Garden of Eden:
"I heard you moving about in the orchard, and I was afraid because I was naked, so I hid." (Genesis 3:10).
In His merciful love and grace God did not leave Adam to hide (He could have, had He chosen to, but He did not).
With regard to this, there are some things we should take note of:
1. God did not predestine Adam to eat of the fruit of the tree of knowledge of good and evil. He commanded Adam not to.
2. Adam is the first human being, and represents all human beings, because all humans beings are descended from Adam and Eve. Not only did God call Adam after Adam disobeyed the only commandment, but He called Adam before he had any descendants.
3. It's therefore impossible that God had predestined only one group of those among all Adam's descendants who would be called unto salvation (through hearing the Word of God in Christ) to be saved by Christ (through their faith in Christ and resulting repentance of sin):
What Jesus said in John 3:20-21 implies that those who continue to hide from the light, do so out of their own choice - not because they were "born that way" through being "predestined to it" (as the doctrine of Calvinism implies). (Adam | human beings did not exist before the foundation of the world, but Christ existed before the foundation of the world):
Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ: According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love: Having predestined us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will. In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace. --Ephesians 1:3-5, & 7.
He was foreknown before the foundation of the world but was manifested in these last times for your sake. (1 Peter 1:20).
So as scripture exhorts all humans who are descended from Adam,
"Therefore, as the Holy Spirit says, "Today if you will hear His voice, do not harden your hearts, as in the provocation, in the day of temptation in the wilderness." (Hebrews 3:7-8).
The Revelation of Jesus Christ closes the Revelation of the God who "at several times and in various ways spoke in time past (before the time of Christ) unto the fathers by the prophets (and) has in these last days spoken unto us by his Son, whom he has appointed heir of all things, by whom also he made the worlds; Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high." (Hebrews 1:1-3).
Revelation 22:17:
"And the Spirit and the bride say, "Come!" And let the one who hears say: "Come!" And let the one who is thirsty come; let the one who wants it, take the water of life free of charge."
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