Also, according to you, ONE person as a regular guest in your house could conceivably violate the zoning ordinance.
No, ONE person would amount to a visitor and would not negatively impact traffic and parking in the neighborhood. As I said, there is a line. Is it 5 people? 25? 95? It depends on the specifics.
NOBODY would consider a single person, or a single automobile, showing up at a home each week, a “meeting” which required attention to the zoning restrictions.
The pastor says they “average” 15 people a week. He said the crowd sometimes is as low as 5 people but also said he recently had nearly 30.
If the pastor applies for a permit and then the county flat-out refuses to issue it and gives no reason or chance to mitigate - and most importantly, if there seem to be OTHER non-Bible-study regularly meetings of roughly the same size going on in the neighborhood - well, then you might have an argument.
If the zoning law enforcement is consistent, then you really can’t claim they are merely “using” the zoning laws to restrict religious expression.
Like I said, you would actually have a reverse-discrimination issue if the county allowed the pastor to waive the permit application process while enforcing the zoning for other non-religious groups.