I can't speak for anywhere else, but again, in the uber-liberal/one party state of California, ALL not-for-profit organizations/corporations are tax exempt. There's nothing unique about religious ones. Churches pay no income tax. They also pay no property taxes. But then no not-for-profit corporation does. The point has nothing to do with religion, it has to do with not-for-profit.
I've heard complaints that in the USA, clergy can have tax-exempt "B.A.Q" - Basic Allowance for Quarters. For a lot of pastors, this is a big deal since everything related to housing (not just the mortgage or rent) can be declared as BAQ. This is a big help to churches too because they can pay their pastor less than otherwise because perhaps 25 - 50% of it is tax exempt. But actually, this has nothing to do with religion, either. The BAQ stuff in the tax code was written for the military - and then extended to others with the same situation. Like soldiers, clergy in the USA were typically granted free housing as a part of their renumeration package - but increasingly, neither the military or churches supply this housing. Instead, they simply pay the military or clergy person more and then they secure their own housing. There were complaints that this large increase in salary in lieu of quarters should be tax free since it causes them to pay more taxes than their equals who are given housing as a part of their salary package, and that exemption was granted. So while this is a major exemption for the military and clergy (and some others), it too has nothing to do with religion.
- Josiah