But non-profits have to pay property tax, right?

I don't think religious institutions have to pay property taxes.

Ok, I looked it up: “states subsidize religions to the tune of about $26.2 billion per year by not requiring religious institutions to pay property taxes for property worth about $600 billion. This subsidy is of particular interest because property taxes pay for services such as firefighting and police, which religious institutions use the same as corporations and private citizens.”