text: Religious 'witnessing' is protected in general; no one is prevented from stating their opinion anywhere in public.  There is one very important fact about free speech IN CHURCH, that D. Trump does not think about (and apparently you don't either).  Christians generally consider their church to be a holy space, the 'house of God' where they modify their behavior accordingly and receive inspiration for the week.   Talking about any politician as if endorsed by a supreme being violates that covenant.  Maybe Trump has thought of that: he loves to be bowed to, and it would make him feel really special to hear his name spoken in that context.