I think I understand why religion is so successful

It's because it is the absolute bottom floor of any descent into crepitude. That's all I can conclude from looking at the fate of various cable television channels: they all seem to start out well with commendable goals, and pretty soon they're all selling out to the cheapest, sleaziest advertisers and producing the worst shows they can imagine, all to pander to the lowest common denominator. Look at The Learning Channel (you won't learn anything watching it anymore), the History Channel (yeah, if your idea of history always has Nazis in it), and the SciFi channel, which now isn't even trying and has renamed itself the SyFy (what?) channel and hosts what I once thought was the lowest of the low, Ghosthunters.

But the Discovery Channel has out-bottomed even the SyFy channel: they have made a deal with Satan the Catholic Church and will be producing a show on exorcisms.

This is why NetFlix will conquer the home entertainment universe: all the broadcast and cable channels have become the domain of the dumb.