The question is what portion of this church-money actually goes towards charity work. Something like 80% of Oxfam's income goes towards more-or-less direct charity work. In order to be classed as a "charity" in the US an organisation has to donate something like 5% annually.
Religious organisations are ostensibly exempted from income taxes because they're considered to be non-profit organisations. Unlike all other non-profit organisations with income, however, they are not even required to file tax forms, or account for what they're spending their money on. In most cases they're barely even required to comply with the criteria for their tax exemption, and participants of stunts like Pulpit Freedom Sunday get away with openly violating one of those rules.
http://www.forbes.com/sites/robertwo...dom-and-taxes/
Not only are they exempted from paying taxes on income, they're also exempted from paying taxes on property, to the tune of tens/hundreds of billions:
http://www.huffingtonpost.com/jeff-s...b_1002753.html
http://www.nypost.com/p/news/local/a...NrXY5q5OQlfNuO
How does that make sense, in a modern society?
The Church of Scientology doesn't have to pay taxes or file any tax forms or the like in the US. Do you imagine it's a non-profit organisation?
Megachurches in the US can earn millions for their more senior leaders, enough to buy rolls royces and private jets and mansions. What, that's not a result of profit?
What does the parsonage exemption have to do with charity, except as charity for the wealthier pastors?
http://www.forbes.com/sites/peterjre...age-exemption/
When it comes to taxes churches receive special treatment because they're churches, not simply because they're like charities in some respects.