I don't mean casual religious, but not an extremist cuckoo either.
Someone who...
...Attends church every sunday
...Gives tithe of all her earnings and encourages you so
...Interprets the world and life events as from god
...etc etc.
Would you marry a caricature of a religious person? That's all that's defined by the above -- a picture of someone following a picture of some religious convention. If that convention was strong enough to engulf your community, the answer would be obvious -- of course you would, as that'd be the convention. In a broader society however, we recognize that that caricature and convention alone are not sufficient. So then the question of whether or not you would subscribe to a caricature answers itself. You wouldn't.
But if we're to try to ask a deeper question -- whether or not you would marry someone with deeply held spiritual beliefs, I think we come back to the question of what are your own spiritual beliefs and to what degree are the respective beliefs mutually compatible. Then again, I think it's most fruitful to consider it from your own perspective, and not some imagined other perspective -- i.e. instead of asking you how much "otherness" you would tolerate in a perspective spouse, the better question is how much of your own sort of spirituality you would want in your spouse.
The answer in this thread from my perspective is "quite a lot" -- that the atheist would want a spouse who's quite compatible with atheism. Generalized across the spectrum, I think that this is the right answer, but the difficulty is in how the spectrum is conceptually organized.