I don't have much to add to the OT except this group of ladies would come around every Saturday morning soliciting their religion. FINALLY, I had to yell at them and point at the no soliciting sign in the beginning of the neighborhood and said some other stuff. I offered to recycle their pamphlet or they could have it back. They have not harassed the neighborhood since.
I cannot imagine this happening in any work place and it being allowed. Personal beliefs should be left personal unless someone offers to share. And even then, smile and just appreciate the conversation without judging and trying to convert. It IS harassment, otherwise.