Americans are leaving religion. Why are we still subsidizing it?

The arguments for taxing churches have been around for many years, but there is reason to believe that America’s changing religious demographics will soon give them more traction. As more Americans abandon organized religion, many of the newly secular are unsympathetic to subsidizing religion via the tax code...
http://www.washingtonpost.com/news/in-theory/wp/2015/09/14/americans-are-leaving-religion-why-are-we-still-subsidizing-it/