This was on the Diane Rehm Show this morning.  
Good discussion:  
http://thedianerehmshow.org/shows/20...faith-families
 
Years ago I shortly kicked it with a couple non-Christian men of the African diaspora.  It wasn't a big issue because we were in our 20s and not trying to settle down.  
 
As for a longterm life partner, that is only a Christian  nondenominational who focuses on spirituality more than religion as an institution.  My significant other isn't conservative and doesn't take the Bible that literally (taking the Bible as literature is more appropriate).  We can attend churches of various denominations and praise and worship at home and at church.  We can also figuratively tell Christians to kiss our asses when they try to instill their interpretation of this faith-base on us.  
 
I agree with what the researcher said on NPR.  Troubles arise when people attempt to reach compromise and discover that most religions have common ground--a belief in a high power(s), people should be nice to each other, people should help the needy, etc.  That reminds us that religions are humans who find other humans with whom they agree.  The spiritual and faith dynamic matters more to some of us.