I believe that because religion is such a nebulous concept, there can be no restrictions on religious beliefs, only actions. The way things currently stand in the US (and in most parts of the world where there is a separation of church and state) only religious belief is protected and so "actions" will be judged according to the law of the land and any religious motivation cannot be held up as a defence on constitutional grounds. So in your example, you would just have treat the actions of the church members in isolation to their religious beliefs and look at the conduct in terms of whether those actions constitute crimal behaviour. I could belong to a religion which espouses any manner of illegal beliefs, but I should have the freedom to believe what I want, and the state should only sanction me if I manifest those beliefs into actual conduct. In this regard, religious groups should be looked at in the same way as bikie gangs, both may subsribe to a way of life which is outside of social norms, but no action should be taken to disband them unless their conduct amounts to criminal or other illegal behaviour.