Obviously, operating tax-free makes it much easier for EMF to do so than it is for non-religious broadcasting organizations, but, hey, the law is what it is and it probably ain't gonna change.
And as I've said before, there's absolutely nothing stopping non-religious folks from starting non-profits and owning radio stations. My view is that with all of the changes in the media marketplace, maybe a few new approaches are necessary. I see no reason why alternative music lovers, for example, can't start a non-profit and buy a radio station. In Seattle, a non-profit group owns KEXP-FM. They just raised over $15 million to build new studios. Hooray for them! The same thing could be done in Boston. Or just sit back, do nothing, and watch EMF buy up all available frequencies.