Advertising for souls

I don't think I'm alone in this assumption:
ANY organization that can afford to run full page ads in a national magazine such as Newsweek (Current rate for a 4-color full page ad: $226,590) can probably afford to pay their fair share of taxes.

Can someone please explain to me why churches don't have to pay taxes? Anyone?
Especially now that they are competing with non-government-subsidized businesses for ad space? You can't tell me there isn't a medium sized business or two out there that would LOVE to buy some ad space in Newsweek but paid their taxes instead...

Helping churches harvest souls.

THIS is whyipaytaxes. (so they don't have to)