Churches are the worst for this kind of thing. They can't keep their hands off each other. Everyone has to hug and shake hands and pack in as closely as possible. A nightmare in the making since churches are full of old people.
Methods can be taken to lessen the risk. Limits to people in the church, social distancing of non-family units. Spillover service broadcasts to parking lots with proper spacing. everyone wearing masks/gloves.
The issue is the blanket ban, and the fact of the matter that when it comes to Religion and Free Exercise, the government is required to use the least intrusive method when it comes to limiting said free exercise due to a compelling government interest.