What about the muslims praying to allah to kill the Jews and Christians seventeen times a day at their five prayer calls. Isn't that "hate speech"? I asked this of Gov Arnold when he signed the hate speech law, but received no response.
US Constitution seems to protect it if a case can be made that calls to murder are a part of the Muslim religion. I'll let the Muslims decide what is and what isn't a part of Islam.
Calls for sexual morals, -- the subject of this thread, -- are surely a part of Christianity.
Historically, calls for just war have been made by Christians. Pope Urban II and his call for the Crusade comes to mind.
I think that generally a concurrent use of the public square by incompatible religions is a problem, and the US Constitution should have made a distinction between Christianity as a dominant religion and minority religions. Of course, mass immigration from culturally incompatible lands was not foreseen by the founding fathers.