Lampoon ran out of steam in the early '80s, and wasn't able to reinvent itself because it ran out of talent. People who wanted to do this kind of stuff could suddenly make $100,000 in Hollywood right out of college.
Idiosyncratic belief systems which are shared by only a few adherents are likely to be regarded as delusional. Belief systems which may be just as irrational but which are shared by millions are called world religions.