Only if they conflict with secular law. And sometimes secular law makes allowances even for that (such as the Native American use of peyote).And in the context of that, fine, but even those bylaws are overseen by secular law.
The secular law doesn't prosecute gossip, but scripture certainly makes clear gossiping is not to be permitted in the congregation. The law does not prohibit alcohol, but many congregations proscribe it. The law does not require baptism, but many congregations do for membership.
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