It ought to be obvious that anyone seeking entry into our country should be ideologically certified. We have no obligation to accept subversive elements. Now those who promote Shari'a are subversive elements. Therefore, we have no obligation to allow them in. Indeed we, or rather the government as representing us the people, has a moral obligation not to let them in.
This is just common sense. Trump, not Hillary, possesses this common sense as he made clear in his outstanding Phoenix immigration speech.
But you loathe Trump the man, don't you? And you have some good reasons. I suggest you make a distinction. There is the candidate and there is the candidate's ideological agenda. Both of the candidates have deeply flawed characters. But one supports a destructive leftist agenda and the other does not. And one or the other will be the next president. It won't be Jill Stein.
So, if you are a conservative, is it not obvious that you must vote for Trump?
Now I would like you to read William Kilpatrick, Western Self-Hatred Makes Jihad Possible. It includes commentary on Trump's immigration speech.