You have to remember that religion is NOT just some separate entity or category in people's lives.
It's not just "Well, she's Catholic and I'm Episcopalean," or "She's Lutheran and I'm Baptist." Religion penetrates far deeper than that, although today's society would like to candy-coat the issue, what with all the "it's the opiate of the masses man!!!" as if a person is either "religious" or "not religious."
The reality is that EVERYONE is "religious," in that they have a personal, philosophical belief about how life should be lived. Religion isn't just about life at the highest order (god, cosmic energy, evolution, or whatever you feel is the central gear in the universe), but it's about the middle order and the lowest order of things. It can be something as simple as believing life should be lived mostly outdoors, or even something as stupid as valuing physical exercise.
There are too many movies and shows where they show two opposite religious people coming together and bonding together. And they think that not bonding together is just a sign of "religious intolerance," as if intolerance is always a bad thing.
But I don't believe that. My last relationship was one in which we both believed in a particular label of religion. But in terms of where we were at, personally, in that religion were far different. Her lifestyle today does not nearly reflect the one I live in terms of how "religion" permeates through us. Even then, just because the labels "match" doesn't mean that we match at all.
You don't have to find a perfect match, but I think too many overlook the fact that religious inclinations can have an dampening effect. It's not the ultimate killer or a guarenteed loss, but if your views don't at least compliment one another, then you're in for a little more struggle on your plate.