how do you forgive yourself?

[Faith No More]

Faithnomore, I appreciate the reasoned response. However, I would say that absolute certainty about something is not necessary to justify belief in that something.

True, or else it wouldn't be a belief. I think, however, the more extraordinary the claim, the more skepticism is required of that claim.

I think you also run into the danger of presupposing your conclusion as from the fact that our brains can play tricks upon us, it doesn't follow that all experience of God is a trick.

I didn't mean to imply that everything should auotmatically be assumed to be a trick, but when dealing with a highly emotional issue, we tend to let our biases take hold. I subscribe to the notion that our brains are highly unreliable, and that only our most basic perceptions of reality can be taken with any certainty without outside verification.

It seems to me that this argument may also be used for one to be skeptical about any belief you hold as it can always be said that this belief may be false because our brains play tricks upon us.

This is true, and in my opinion is the most reasonable position to take when assessing the validity of any experience of god. If you want to understand more on this concept, "The Believing Brain" by Michael Shermer is an excellent book.