His is an unlawful order, and has no enforcement mechanism.
The cops and churches need to tell him to pound sand.
My (huge)—15K people attend over 5 campuses—church purposefully does not or offer “membership” or take attendance. Hasn’t for 25 years. Now I see why. (Of course they have email lists though, for those who choose to provide the church that info.)
Churches are to be welcoming to all.