I've noticed that a lot of Christians I know equate "successful person claiming to be a Christian" to being a good person/Christian.
Legitimately, Christianity is the perfect place for salepeople to weasel in (and they absolutely have) because Christians have lost the ability to think critically and scope out "wolves among sheep."
"A Christian said it, and a Christian would not lie!"
All you have to do is put on a face and claim "Christian". It really is that easy!