Because they can't compete with an invisible power that actually exists
To get to the other side
No seriously, a friend asked me this and I didn't know.
This is the plot of Edward Sizzlerhands
The sun exists.
They cause too much brain damage.
banned from the petting zoo...
They couldn't compete with the circus in Washington DC any longer.
Have a good one, son."
Because religions don't like competing with an invisible power that actually works.
Because no church wants to compete with an invisible power that actually works.