Churches have done things to me far and way more "bothersome" than leaving a harmless leaflet on my window. Infact, they have left there own propaganda on my windows, some of it quite nasty.
There are many a thing I cannot do because of church people imposing their views on others. And now you plead that people should not be allowed to drop you leaflets while your at church, because it inconveniences you???
I don't like getting stuff stuck under my wiper blades either. Government ought be for better things than stopping some pet pev of yours. Like it or not the flyers don't harm your car at all.