I've thought about this a bit and I'll do my best to give an answer. When I was jolted awake at 3 am one morning many years ago with the sure knowledge that I was supposed to start a "religious" (for lack of a better word) forum on the BBC, I certainly envisioned it to be a Christian site. The intention was to spread the word of Jesus Christ as best as my poor knowledge and ability would allow me to do.
But at the same time, I never expected to try to keep anyone from posting what they believed. I remember we had a Muslim fellow stop by a number of years ago. He introduced himself, didn't cause any trouble, just asked a few questions and moved on. I've often wondered what happened to him. I pray he found what he was looking for.
So is this a "Christian site?" I suppose it is, but who gets to define what a "Christian" is. I know it's a big question. I've been told by various people that Mormon's, Jehovah Witnesses, Catholics, and probably a half dozen others aren't Christians. Frankly, I don't know. I've been a Southern Baptist all my life. I'm sure there are those who think we're not "Christians."
What I really envisioned was a place where anyone could come and ask a question or make a statement and not be shouted down. I envisioned a place where I could say I believe "X" and you (royal "you.") could reply, I believe "Y." Then we could discuss why we believe those things, without arguing, without fighting, without name calling. Looking back, I suppose I was at least somewhat naive but, I've always believed that those things are counter-productive and accomplish nothing. Not only do they not settle anything between you and I, I believe they tend to cause others, especially people who really aren't on either side, but are curious, to get all glassy eyed, to tune out and move on. If I post a long list of Bible verses that "prove" my point, and Joe over here who wants to learn, takes a look at that list and says, "Nope...not interested...let me go find something about fishing.", what have I accomplished? Have I really done what Jesus told me to do? Am I doing this for my glory or for His? Am I worried more about winning an argument? Or winning souls?
I still haven't figured it out.