Chas, good points so maybe a bunch of child molestations lawsuit that they loose in court, might be the thing that causes them to loose tax exempt
status
No, I don't think that would be the trigger. Federal law allows all religious organizations and churches to get 501(c) (tax exempt) statuts. The IRS can't revoke the status because they don't think an organization is "deserving." It would take a change in federal law to make additional requirements to keep the 501(c) status. As I mentioned, there is not going to be political support anytime soon for this kind of change. I doubt you could find 5% of members of Congress who are in any way interested in picking and choosing what religions get the tax exemption (or eliminating it all together), much less any kind of majority. There is too much risk (being labelled as "war on religion", etc) and not enough public support. Plus there is a significant risk that if they change the law to favor some religions and not others, it could be invalidated as unconstitutional.
It would be far more likely to be some kind of financial wrongdoing that could bring a change about. Things like enriching insiders, private benefit, political activity, not paying taxes on unrelated business income, and other financial wrongdoing are all part of the already existing law that nonprofits must follow and can get in trouble for not complying with. I don't know how much of this is going on, if any, and what the chances are of airing it publicly, but it's just so much more likely because it wouldn't require passage of new laws.