@farmerman,
And would you please tell me under what theory of law that zoning can not cover the behaviors and actively at private homes to prevent having a public nuisance?
All kind of laws under common law police powers are enforce every day in this country concerning private homes.
You have noise level controls you have when you can water your lawns, the time of day that you can mow your lawn IE part of the noise level. The kind of lighting system around your home.
Hell the zoning can tell you who can live in those homes in the first place and the number of people you can have in those homes at any one time.
The pastor is setting up a public nuisance that reach out of his property into the surrounding neighborhood as a direct result of those meetings.
Saying private home over and over does not change either the legal situation or the duty of the town to enforce it zoning laws.