I cannot fathom why churches are automatically tax exempt. Regular nonprofits have to jump through all kinds of hoops to prevent these kind of shenanigans. We are supposed to have a secular government. How is it that we single out this one class of institution for special treatment?
Religious orgs are a time-tested model for providing sustainable and widespread social cohesion, which is a huge positive externality and also protects the most vulnerable against marginalization and oppression. The tax exemption seems obviously warranted on that basis alone, even abstracting away from any of the more visible charity work or social support that these orgs usually provide.
I think we have read different history books.