10. Is it possible not to know God?
It is possible not to have a good relationship with God. It is possible to deny and reject God, and to be denied and rejected by him. It is possible never to have heard of Jesus or salvation. It is possible to be bound for final judgment and eternal damnation by God.
But it’s not possible not to know God at all. Paul writes, “For although [the wicked] knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened.” (Romans 1:21, italics added)
So we all know of God on a basic level.
11. Are we responsible for knowing God?
We are responsible for knowing that God exists and acknowledging him as such. No one can deny God out of true ignorance.
Anyone who claims not to know the basic truths about God, that he is the Creator of the universe and outside it, that he is eternal and divine, is not ignorant of the truth. He is suppressing the truth. He is guilty of sin and deserving of condemnation.