It's a joke about how segregated religion has become. Each year new religions are formed, and existing religions become less populous.
It's just a humorous way of showing how religion is on it's way out.

You are right when it comes to weird religions. I've only heard of a few of them, such as
Pana Wave and
Jediism, which is more than enough.
Wise men are instructed by reason;
Men of less understanding, by experience;
The most ignorant, by necessity;
The beasts by nature.
You can guess where religion fits.

Honestly, discussions between agnostics, atheists seem much better than those led by religious people. I'm surrounded by a ton of people that are very religious, and they're often closed minded as well. I can not discuss a important issue with them, else they call out the Bible on me. I'd say that one of the main factors that makes religions prosper is the fear of nothingness after death (very common in people, even though some don't want to admit).