Come to think of it, this whole "Bible" thing is a bit silly. I think most of us can agree that the Bible is not the "word of God". If God has a Bible, he probably has it in the "humour" section of his library. Christians ... I'm talkin' the born again kind ... tend to be selective in their readings. Many US Christians support capital punishment, a convenient ignoring of one of those commandment thingies. And many muslims conveniently forget the warm and fuzzy parts of the Koran ... and there are lots of them.
But I do think that spirtuality is important for many folks, much more important than, say, Papal infalibility, which is a fairly recent idea, or the Biblical injunctions against masturbation ... mmm, that would put the number of sinners in the world at around 7 billion, give or take a few.
And if two people want to add a spiritual dimension to their relationship, I can't see why anyone would want to put road blocks in their way.