Catholic v. Christian

"That being said I know a few Catholics that are definately christians."

Isn't a "christian" just a follower of Christ? Isn't any other attempt to define it really only an attempt by one cult to make itself feel superior to another? Who is to say who is christian or not? Personally I don't think any "christian" interpretation has got it right yet, and Jesus would be ashamed at what his teachings have turned into.