There is a threat coming from Muslims that is worldwide. I was born in 1987, so nearly all of the violence and terrorism that I have seen in my lifetime committed in the name of God was done by Muslims.
The lifestyle of the Prophet Muhammad was one of polygamy, cutting off heads, pedophilia, pillaging, looting, and depriving people of freedom, so it was completely everything America stands against. Most moslems are for Sharia law, which is very much part of Islam ,and is very anti-American as well.
They exalt as a prophet of God , somebody whose views and policies were very anti-American, and about as far anti-American as one can get (despite America not existing at that time, but you know what I mean).
We have every reason to be highly suspicious of Muslims and single them out, not because most of them are bad people, but because they exalt such a figure , and there is also a threat that is coming from them that is not coming from others in the same degree.
Donald Trump is actually using common sense on keeping a nation safe in regard to his singling Muslims out.
The above is problematic on several counts.
First of all, all religions, including my own, have a checkered past, and like Jews and Christians, Muslims are not monolithic. Studies done here have shown that the vast majority of Muslims (95% in one study) condemn the terrorism they've seen.
Secondly, shari'a only can be used for the country if that country is controlled by Muslims. Where some are getting confused here is that shari'a in a non-Muslim state only applies to the Muslim community's internal affairs as long as it doesn't violate national law.
Thirdly, Islam actually in many areas was rather liberating, which is why it spread so fast and continues to spread, and I'm not referring to being spread "by the sword". Yes, there's no doubt that some aspects definitely run counter to American culture, but we need to remember that the vast majority of Muslims came here to get away from repressive regimes, some of which had shari'a, in order to start a new life.
Fourthly, if we want to defeat groups like ISIS and al-Queda, we desperately need the help of Muslims both here and overseas. Without their help, these groups not only will survive but they will continue to spread.
And finally, what Trump is saying and proposing to do runs entirely counter to both "common sense" and "keeping a nation safe". His bigoted and racist approaches will further divide an already divided country and will also aid and abet the enemy.