Also I will add 1 example, perhaps we will see how you answer it.
When Chaim will be married B"H and his wife gives birth to a son. On the 8th day he is required to perform a Brit Milah (under normal circumstances when he is healthy). Let's say America bans circumcision will you just tell him, well too bad. He isn't currently allowed into Israel, and America bans it. What will you do in this case? Say, well the Muslims are doing it soo we want them to leave?
- anyway I will tell you this, at the places where this was banned (like in the U.S.S.R.) people still did this and people will still do this. Jews and Muslims alike. It is just bad will and then an excuse for trouble etc. Also perhaps some who know very little will just stop doing it (like also happened with some Russian Jews). Not everyone will just get up and leave. Of-course their will be some, but still.