Of Liking, Dating and Lists
You can absolutely "like someone" and not want to date them. Hell, you can "LOVE" someone and not want to date them. I totally love one of my best female friends, tell her that all the time, but absolutely refuse to take it beyond friendship because I know it would be an absolute freaking disaster. It takes a lot more then "liking" or even "loving" someone to make a relationship work.
She pushed to "get together", and I told her as gently as possible, "No way, no how, never going to happen". She was hurt, and sad and didn't talk to me for 8 months, but now she is like "I'm so glad you were just up-front and honest, because no guy has ever done that, and now I know that we will always be there for each other as friends."
I've been on both sides now, and I can say with authority that usually the person who isn't "into" getting together is the one who can see more clearly how well things are going to work out.
Lists:
Pretty much everyone has them, even if they never write them down. Basic requirements to date someone, and "Deal breakers" that mean it will never happen. As a general rule it's a good thing, it's called having standards, and it helps "winnow down" the pool of potential dates from "everyone on the planet" to a somewhat more manageable subset.
Kudos to your friend that she knows what she wants, or in this case what she doesn't want (and while religious differences are not an insurmountable obstacle they are pretty major, especially if you and the lady in question are still somewhat on the younger side).
However, there is a dark side to lists, in more then one way. First there are the totally shallow lists along the lines of "Has to bench 250" or "Must have blond hair" or has to have at least a "C cup"... these are things which don't matter in the long run if your interested in getting your relationship past jumping in the sack. People with these kinds of lists - best just to avoid them, they tend to reflect shallow immature people who your better off not wasting your time with.
On other hand one of the stealth problems with well defined lists even ones which are not populated by shallow superficial requirements is that pretty much everything that you could put on a list of requirements for a relationship will probably have second order effects you might not anticipate.
For example, when someone puts "Caring And Committed" on their requirement list, they probably mean "Cares about and is committed to ME!" (and sometimes only me) but someone who is caring and committed is probably going to care about and be committed to many areas of their life, their friends, family, job and hobbies in addition to their girlfriend / boyfriend, which means your going to have to share them. Often an unintended second order effect.
As another example (which might make more sense considering your situation) it's perfectly normal for a devout Christian to put "Christian - Devoted to God" on their relationship list. But, the second order effect might be that the person who fulfills this item may be more devoted to God then they are to the relationship. If they suddenly decide that God want's them to, say, devote themselves to spreading the word in another country, it can turn your life up-side-down. Or let's say two "Devoted to God" people get married, and then one of them decides that God doesn't want them to have sex or show affection anymore. Whoops (and don't think that's impossible, I've heard of exactly that happening).
And last but not least, no list is ever complete, and even if it was a list of check boxes is NOT a guarantee of compatibility. We are not computer programs, we are immensely complex human beings with multiple layers that no mere list can ever describe. No one can really tell you why some matches work, and others don't.
My last serious relationship has a very well defined "list". And believe it or not, I actually matched about 90-95% of it. And you know what, it didn't help that much, we still aren't really compatible, and not (as you might assume) because of the 5% which did not match the list, it was other stuff that wasn't even ON the list.
For those who make lists, I have one piece of advice. Be VERY careful what you ask for.
For those who don't live up to someone's list I say: Congratulations, you just found out that odds are the relationship would not work before you actually invested any time or money in it. You just landed on free parking, count yourself lucky, and MOVE ON.