PHeMoX,
If you don't have a divine revelation (the bible) you cannot account for your life experience. Men are so corrupted by sin that they cannot even understand the bible correctly- thus all of the denominations and cults. But without the bible you cannot account for logic, science or morality. Notice I did not say you cannot be moral, scientific, or logical to some degree. But you cannot understand how it's possible.
And furthermore the bible teaches in Romans 1 that you know God absolutely from his created order and you do not like to retain him in your knowledge. Rather in your mind you change his image into an image made like to a corruptible man. Thus people claim the God of the bible is a dictator like Hitler or Stalin. Or God is a murderer or egomaniac etc. and slander and mock the source of logic, science, love, beauty.
Then they expect him to judge them according to their own moral judgments. Not going to work that way. God will judge in grave seriousness.