If you insist they give up their culture immediately you will be seen as trying to take away their culture. Just like how gun rights advocates perceive attacks on gun culture.
Solidarity is a normal reaction to real or perceived hostility. In history the social pressure to assimilate resulted in immigrant collectivism in order to support each other; Chinatowns, little Italy and a myriad other ethnic enclaves formed partly because of this pressure.
First, I'm glad you framed the fear in terms of religion instead of ethnicity. It's more honest than pretending these immigrants are different than all others in history.
Second, I get more pressure from Christians, Jehovah's Witnesses, consumerists, stoners, drunks, and Greenpeace to "live the way they do" and "believe the same things they do." There are proselytizers in every group.
And you are being hypocritical. You are pressuring Muslims to "live the way you do" even while you complain that they do it to you.