That's a bit extreme, but (if true; I didn't see this story) it would probably still pass constitutional muster in the present situation. Mississippi is playing catch-up here; they were late to social distancing and shelter-in-place. If the governor used his emergency powers to generally forbid all kinds of businesses and organizations, except those delivering "essential services", from operation, there would be no constitutional bar to putting churches in the same boat. Such actions only get dicey when religious organizations are specifically singled out. (See one of my all time favorite religious exercise cases: Church of Lakumi Babalu Aye v. City of Hialeah for how this works.) That Home Depot and the grocery stores are exempt is straightforward enough. Though some people might argue otherwise, you don't suffer all that much for not going to church every Sunday; God, as is well established, listens to everyone's prayers, no matter where or when they are offered. You could get and spread a potentially fatal disease by joining a congregation without the right constraints on your behavior.