I guess I don't understand the point of arguing. It's not about whether they're doing it right, or who is the true believer.... If you follow Christ you are, by definition, a Christian. How you do it is up to you and your particular denomination. It's the same with Islam and Buddhism and Hinduism. There's a reason why each religion has so many interpretations. There isn't a "right one." Well, I guess each person thinks they are following "the right one," but are you arguing that your faith is the one true faith? Is that why we're having this problem?
Also, I could make a pretty solid argument that the hate groups like Westboro are much more historically accurate in their portrayal of Christianity.
Couple examples for ya:
The Crusades
The Spanish Inquisition
The Salem Witch Trial
A lot of uncool shit has been done in the name of God and the name of Christ. While I agree with you that those people clearly aren't following the true teachings of Jesus (love your brother, judge not, etc), it's still part of the Christian history. And while I'm sure you'd love to wipe those events from the history books because you don't think they reflect the true teachings of Christ, they happened and I would hope that they, along with douchebags like Westboro, server as a reminder of the darker side of organized religion. People will interpret a message differently. Some Christians do good things, while others do bad things. It's the same with Islam. Millions of really good Muslims, but also quite a few bad ones.