If you give reasons for believing in God, you've just admitted that you believe in a higher God, a conceptual personally-applicable truth-determining God, an ultimate authority referenced to adjudicate the issue.
And you yourself are the god of what to believe about the evaluation. You function in the image of God.
So reason itself becomes the God that provides the method for determining whether or not God exists. And you make the final god-like decision about God.
Atheism imitates belief in God but without attributing psychic unity or personhood.
Both believer and atheist assume God-like rules for minds, and play the role of God in order to determine whether or not God exists.