I do not think that the majority of Christians are that wacky. In fact, most American Christians are quiet about their beliefs and are not trying to convert the world. You got as many whack job Christians as you do insurance salesmen or any other "grouping" of man you can think of. Just part of living in a whack job world is all.
Ask a normal believer if they would build a 600 foot super jesus on the highway and see what they would say.
Buddy Jesus for the win