Jesse Bering investigates what happens when atheists and believers intermarry:
[T]here’s a growing trend in which exact denomination matters considerably less for marital satisfaction than does the degree or type of belief. … A shoulder-shrugging agnostic or lukewarm “spiritual but not religious” person, for instance, would probably be able to tolerate an atheist spouse better than a dead-set Muslim could ever hope to do.
The Dish 