I've never understood the connection between political activity and tax exempt status. An individual or a corporation doesn't pay a different tax rate depending on whether they endorse a candidate. If they are a non-profit, they shouldn't pay taxes. If they are for-profit, they should.
This.
Also, I'm an atheist and even I think organized religion needs a stronger voice in American politics, not weaker. At the very least - they would act in good faith, which is something one cannot say about many other special interests dominating much of America's governance. They would also restore some semblance of parity in some of America's social issues.