Preventing people from using public property to force their religion on other people is not "forcing our unbelief" on others, it is standing up for freedom of religion. You have no right to use public property for your indoctrination.
"Sisters, you know only the north; I have traveled in the south lands. There are churches there, believe me, that cut their children too, as the people of Bolvangar did--not in the same way, but just as horribly. They cut their sexual organs, yes, both boys and girls; they cut them with knives so that they shan't feel. That is what the Church does, and every church is the same: control, destroy, obliterate every good feeling. So if a war comes, and the Church is on one side of it, we must be on the other, no matter what strange allies we find ourselves bound to."
-Ruta Skadi, The Subtle Knife
-Ruta Skadi, The Subtle Knife