The question of whether Jesus was born divine, or became divine has been debated for millennia. The answer is “Yes”. Joshua of Nazareth was wholly human and wholly God, as the links explain.
The question as to the status of the rest of us, and why couldn’t we also become divine is worth examining. There are three different answers to this, all of which can be considered as acceptable within various Christian Theologies (and to varying degrees with some other religions too).
We can / could all become God. We are all Children of Adam, God’s specially created creatures, who alone have the ability to act with Free Will, to walk with God, to dwell with Him in Heaven, and to become one with the Godhead. The Spirit of God was breathed into Adam and all his descendants. Humans have ‘The Mystery’, the essential God / Spirit Element that enables us to make free choices and return to the Father (or Creator Spirit or whatever). You don’t have to believe in Adam, Christianity, or Genesis to give the idea that we are God’s Special Creatures with a Divine Spirit within us some credence, as the links show.
We can’t because only Jesus was conceived of the Holy Spirit and born of The Virgin Mary, and thus had the potential to truly be ‘The Son of God’ and ‘The Son of Man’. A true child of both God and Adam. Born Deity incarnate and lived and died and resurrected as God incarnate. Truly God’s only conceived son - the Son of God. (Adam was made, not conceived. The rest of us are conceived of men and women).
I said three.
Option 1 splits into two as regards why then we don’t become God.
1 - A We have the potential as sons of Adam, but … Adam fell from that high estate by sinning and trying to become a god in his own right - knowing and creating his own morality, rather than simply perfectly obeying God’s Perfect Will. This separated all the line / descendants of Adam from God, resulting in Death. Thus we, his children, are all contaminated by that Original Sin and can never achieve godhead in our own right. It was necessary for Christ to come into the world and die for us to re-establish our connection with God the father by faith in the son. This is the doctrine of Original Sin. Frankly, CK is not particularly impressed with this as a doctrine … but hey, I’m humble enough to acknowledge that some of the guys who came up with this may have been more knowledgeable, and certainly more spiritual and virtuous than I am. It’s certainly consistent with Genesis Theology. While one can have plenty of problems interpreting Genesis, it’s not to be lightly dismissed, since Genesis is a foundation stone of the Abrahamic religions.
1 - B “For all have sinned and fall short of the glory of God.” The reason I don’t give much weight to the Original Sin idea is because it’s totally redundant. (I’m not particularly impressed with the idea that God punishes children for the sins of others either). Who needs it? Joshua of Nazareth was born a babe with God potential, and never compromised that potential. Was he born God, or did he become God? Yes. Both. For the rest of us, regardless of whether we believe we are Sons of Adam or not, we’ve usually sinned by the time we’ve cried our first ‘Me. I want …” and certainly by the time we have grown to create an ‘Id’ that distinguishes ‘ME’ from ‘NOT ME’ where God is included in the set of ‘NOT ME’. “To err is Human, to forgive is divine.” We’re all very Human and we’ve all erred, failed, and sinned many many times which is why we fail to realise whatever God potential we may have. It’s also why everyone needs an alternative avenue to reconciliation with God, which is what Christian’s believe Christ’s sacrifice provided.
So - there’s your answer. Pick, 1A, 1B or 2 - it all comes out the same - we need an alternative avenue of reconciliation with God because we can’t seem to make it on our own regardless of whatever potential we may have been born with.
Hope these thoughts help.