I think the parent means that religions are created with outlandish claims (resurrection, xenu, miracles, immaculate conception etc) in an effort to weed out critical thinkers (trouble makers).

Funny story. I became a believer (after growing up doubtful in church) when I came up with what I felt was a plausible theory for God. I stopped being one when I got bored of the intellectual starvation in church.

I've always believed that spirituality cannot survive in a church, but that's a discussion for another place entirely.

My favorite example is Mormonism. By having such a ridiculous story at its center (see the episode of Southpark for details in palatable form) you automatically select a perfect population.