Sure, I would marry an atheist. But to be clear, I'm not a fan of ANY type/believer who outwardly disrespects others, or belittles their beliefs. Conversion of any sort disgusts me. My boyfriend is an atheist and he never debates/argues about it, nor does he really like the hardcore atheists who rip religious people to shreds. He thinks they're one and the same - and really, they kind of are (given that many atheists are just as steadfast/militant in their own beliefs as those of an extreme religious leaning are - just opposite extremes). Both of us would respectfully discuss why we believe what we believe, but basically don't bring it up with anyone unless they bring it up first. I also think that there are highly moral, extremely good atheists/agnostics, so Morality when it comes to child-raising doesn't require religion. Religion does not a moral person make.
Anyway, I am of the opinion that religious/spiritual beliefs shouldn't be tied to mbti temperaments, and that these beliefs fall outside of mbti. So the premise of the OP is kinda.. weird to me. I know several agnostic/unspiritual NF's, as well as NF believers. I think the same could be said of every other temperament. My point being - I'm not sure what polls like this really prove; religion/spirituality is such an individual thing. I as an INFJ am agnostic/atheist, and be quite firm in that, I have an INFJ friend who is basically the same, and another INFJ friend who is totally opposite, is hardcore Christian, and would never marry an atheist because her beliefs frame her total worldview and frame every single choice she makes as well as how she perceives everything.
I suppose technically I'm agnostic, but given mainstream notions of everything, I'd more likely be categorized by most as atheist (given my notions of what a higher power would actually BE). And, I am really not into any sort of religion or defined spirituality at all - so there isn't a single organization or group out there that I'd ever be a part of. I also don't really... dwell on anything spiritually-slanted (in the sense of higher power/religious-like spirituality), at all, and it's not really part of my worldview.