Freedom of religion, yes. But it used to be understood that certain lines could be drawn. For instance Satanism was not regarded as a legitimate religion. And peyote smoking actually was not a part of any Indian religion until a few drug takers pretended that it was.
Islam has a long, long history of rape, conquest, murder, enslavement, intolerance. As it happens, there were very few Muslims in America until Teddy Kennedy changed the immigration laws and they started pouring in.
Can we tolerate people who will never tolerate us? Who will murder anyone who tries to leave their religion or breaks any of their intolerant sharia laws?
At some time one has to distinguish between legitimate religions and cults.