Holy Street Fighter, Batman!
I've recently encountered a very strange little game: http://onemorelevel.com/game/faith_fighter
Having rather irreligious tendencies I rather liked the idea - select a divinity, then battle against all the others in turn. Each deity has a selection of special moves, as well as the normal collection of punches, kicks and so on. It plays like a demented, sacrilegious Street Fighter.
Those of you with devout beliefs may wish to stay away. Those of you with a playful streak may want to see if "your" god can vanquish all the others! As a means of choosing the one true faith this is probably not the best option - as a bit of fun, it's a hoot. And it's free!