Duh!...I m with u pal...*even if* is where I started to believe ya.....
It certainly ought to be voluntary, at a civic level. Now eventually those who make efforts to get on the wavelength of God will discover that He desires to be kind to all, but that some people won’t permit it because they refuse to receive the kindness to the purpose He intends.
Anyhow, seems simplest, that if they are causing problems in western society, to not bring them to western society. Set up some kind of community elsewhere, where they can run it in accordance with their religious beliefs, where they can go if they wish, and which they can leave for their former homes if they do not like it.