If a church is nothing more than a theology club, which many of them are, then they have every right to exclude those who won't adhere to the club rules.
But when they pretend they are the representatives of Christ, and then they behave like a redneck theology club, in Christ's name, they are misrepresenting themselves, and misrepresenting Christ. I couldn't care less about their theology club. I do care that they misrepresent themselves with the intent to lure people in, and then misrepresent Christ, by condemning and shunning those they lured in and rejected.