Certainly one of them could be
the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God
(2 Corinthians 4:4 ESV).
This would probably be the first reason offered by many believers, and the last reason offered by the atheist.
Consider this: Perhaps some that have walked away from God are actually rejecting a misrepresentation of God.
If someone rejects a misrepresentation of God, are they not actually walking toward God?
There are many misrepresentations of God.
There is one true representation of God and that is Jesus Christ.
That’s not just my opinion–he said it.
I will write a series of posts under this new category. Stay tuned.