New religions lose out in favour of newer religions.

[zotz]

"Scientology uses strictly scientific methodologies to undo the damage done 75 million years ago by the Galactic Confederation's evil warlord Xenu—we offer our preclear followers procedures to erase overts in the reactive mind. Conversely, Fictionology is essentially just a bunch of make-believe nonsense."

The Onion investigates.

Thanks to serpentstar for pointing it out.