And I am sure we will all be comfortable living as Muslims or as dhimmis (second class citizens) under Sharia law... or dead. Your new Muslim overlords do not offer many choices.
If ignorant people fail to remember the fact that Islam is out to conquer and dominate, per the Koran, they will.
Islam has been around almost 1400 years. Christianity and the West already defeated Islam. Islam could cause a problem, but it it has already lost. Leftism, however, is a great threat to the West. Right now, they are using Islam. Losing sight of the real threat is a big mistake.