You don’t have to specifically declare yourself a Muslim free zone.
Just decorate with a lot of pig decorations, offer free bacon, or have lots of bowls with free pork rinds.
Even a stuffed pig or two near the entrance should do it.
Good ones.
Have a squealing pig recording ready to play outside the door.
“Hogs Slaughtered On Premises” Sign
How about adopting a pot-bellied pig to be the store mascot, and have him always inside the store!