He doesn't want Muslims congregating there in any numbers. He didn't say anything about agnostics, Jews or the occasional Presbyterian.
I sent him a little reminder in honor of his efforts:
Congress shall make no law respecting the establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.