Um, there is a book called The Holy Bible, and some religions choose to practice what the Scriptures require, and, some religions choose to not practice what Scriptures forbid.
That is a life discipline.
It is not a punishment.
Well, when they choose to inflict their practices on others, it becomes an unjust punishment.
When someone comes among them, they are certainly free to explain their beliefs and practices. But they are not free to do so with the expectation that the newcomer must agree, and must oblige their beliefs and practices. But this never occurred to this church group because they presume themselves to be absolutely right and endowed by God with the power to judge and punish anyone who doesn't agree with them. And I don't believe this has anything to do with Christ, or even with religion. I think it has everything to do with prejudice, politics, and ego.
If you are a guest in my house I expect you to conform to what I find acceptable behavior as I would do as a guest in your house.
Christ has no house but the human heart and mind. Jesus had no home. He came to serve humanity, not order us around in his own house. And those who think this is what a Christian church is: a house where Christians get to order each other around, are fools. Because what they are engaging in is not Christianity, as they think. It's just a religion of self-righteousness.