So is a daily call to Christian prayer, which will certainly not be allowed. Judge Roy Moore would be glad to hear your interpretation. 
Just to be clear: it specifically protects RELIGIOUS speech:
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;"
A call to prayer is a pretty clear "free exercise" of religion. End of story.
So is a daily call to Christian prayer, which will certainly not be allowed. Judge Roy Moore would be glad to hear your interpretation.