A government cannot ban the religion itself, but the government can and should ban the illegal acts carried out in the name of that religion. If the religion cannot be practiced without these illegal acts, then well, 2 birds with one stone. But I don't think the government should be allowed to prosecute religions, that's too much power.
In this case, the child abuse would be illegal and should be prosecuted.
In this case, the child abuse would be illegal and should be prosecuted.