It has nothing to do with the first amendment. The government isn't restricting what churches say, it's just saying that they get an active benefit by not talki

It has nothing to do with the first amendment. The government isn't restricting what churches say, it's just saying that they get an active benefit by not talking about political topics (which is widely ignored). They're free to talk about taxes all they like, but that just means they get treated like the rest of us.