You are claiming that if members of a church or mosque do not obey all the customs and rules of the church or mosque, then they are trespassers. No one has provided any specific statute or court case that upholds that. Until someone does, you're just pretending you know how a court would rule on those very narrow circumstances, and you don't know that.
Actually, the church or mosque should just revoke their membership if the breach of rules is so serious. There is no mention of violence or wild behavior or property damage. It should not be a police matter. Then if they try to reenter after membership is revoked, it might become a trespass.
The police have far more important things to do than enforce church rules and customs.
No. What I'm asserting is that people who are on private property are on that private property either by invitation, or without invitation. If they are there without an invitation because they either never had one to begin with, or because it was rescinded, then they are by definition - a trespasser.
You - and the author of this article - keep trying to make this a about religion. It's has NOTHING to do with religion, and everything to do with the rights of the private property owner, or his designee.
In this case, the Imam was either the owner of the mosque, or he was the legally recognized agent of the mosque. It's his prerogative to say who stays, and who goes. The police will ALWAYS respect the wishes of the private property owner.