I’m an atheist. So why can’t I shake God?

[athrock]

Who believes in 'nothing'? I certainly don't.

I just sort of read past that bit in the OP.

I believe in plenty. 

But the things I believe, are supported with evidence and reasoned argument. 

if someone is able to show me that I have a belief that is not supported by evidence, you know what I will do? Stop believing it.

Why on God's green earth is the human brain wired for faith when our development is the result of purely evolutionary processes with no supreme being involved at all?

According to Pascal Boyer of Washington University, research suggests that our brains are wired in a way that makes believing easy. In a 2008 essay for the journal Nature, Boyer wrote that several features of the human brain predispose us to religious belief.

Among the psychological tendencies at play that are complemented or satiated by religious beliefs are: an ability to relate to imaginary or unseen figures (imaginary friends, deceased relatives, etc.), a desire to avoid danger, and the uniquely human ability to be a part of and maintain massive social structures.

It doesn't say the brain is "wired for faith."  It says that multiple cognitive tendencies are satiated by religious belief.  Why is this?  Likely because these cognitive faculties are very general and powerful, such that when they are misapplied to religious beliefs, they're also strongly sated.  That doesn't mean they were wired for faith, only that we are wired in a way which makes faith possible.  This goes back to our being a highly social species.  We've evolved multiple cognitive abilities that make dealing with intangible minds an easy and fluid task.  When this ability is over-extended, it can be useful in creating relationships with intangible and non-existent minds.

Is it possible that God gave us brains that are pre-wired for receptivity to His existence to make it easier for us to believe in Him?

Possible, but unlikely.

Just to clarify, "Wired for Faith" was part of the sub-headline at The Washington Post and not my choice of words.