Given that the pastor had purchased an adjacent vacant lot and was using it as parking lot for these meetings, I think there’s pretty strong evidence that the car quantity WAS the real issue. I think we can safely assume that nobody else in the neighborhood was maintaining a vacant lot for use as parking lot in conjunction with meetings of any kind being held in their homes.
So he had a vacant lot with what . . . six or seven cars on it. Big deal.
I own a 1/3 acre grassed lot next to my house. Vegetable garden there. It has two out buildings on skids (in our county those are not taxed), and a 26’ house trailer sits there. I have had as many as 20 cars on that lot when we’ve had meetings and the lot still looks mostly empty, certainly not cluttered.