Don't you get that feeling based on most of the responses to this thread? It's called purity spiraling. If you don't believe exactly like me, then you must not be Christian at all! I think that these people are honest and sincere. But I also think that purity spiraling is a tool used by our enemies to destroy unity within Christianity.
IMO, perhaps the saddest point in the history of mankind was Martin Luther's schism from the church. He had some valid points. The church should have said "Yup, you're right! Selling indulgences is wrong! We'll stop!" But instead, they let pride take over and and attacked the messenger. Then Luther, feeling attacked, went too far and divided Christianity. Others followed and now we've got thousands of protestant denominations. This division led to one brother war after another. I think it's clearly the work of satan.
IMO, if you put your faith and trust in Jesus, then you're a Christian. Most everyone has some sort of weirdness going on along with that, but I think they're still Christian.