Why are people atheists?

Any psychologist will tell you that good valid evidence doesn't always convince people. People live in denial all the time about all different kinds of things every single day. What makes an atheist any different than those people?

As a theist I can point to the plethora of patterns and order in the universe as evidence for design. What reason other than denial do atheists have for being atheists. What could possibly contradict the truth of God's existence?

Why are people atheists?
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