Creation, by Jeffrey Ford

Creation is a triple threat--got nominated for all three major SF awards, and won World Fantasy Award short story honors in 2003.  And it was deserved--really good stuff.  It centers on the protagonist's foray into Creation, a result of his religious education but critically enhanced by his atheist father.  It just carries you along, like a really interesting dream.  It's a great online gem to find, and well worth a few minutes to take in.  I give it four stars.