There are many things in the Bible about why we should believe in God... why He is truth and the light. But what does the Bible say about atheism? Those who don't believe in God?

There aren't many verses that specifically call out atheists or non-believers, but there are Bible verses about atheism. The Bible identifies those who say there is no God as fools. They are fools because the evidence of God everywhere. These people are corrupt and should not be believed.