Are Turkish immigrants (most of them are Muslims) welcome in the USA?

It depends who you ask. Just like any country, there are some overterritorial maniacs who want noone around from any other country. And there are also some intelligent people who understand that a majority of people came from migrating ancestors. Understand that people like to travel in the world, and don't think everyone should be confined to a tiny, oppressive space. There are also people who aren't totally greedy and don't believe the place belongs to them and them only.

I'm afraid not...a small minority of Muslims have brought nothing but disgrace and hatred upon the Muslim society.

If they pass the merit tests...sure. Merit tests? Those would be: are you educated, do you have a marketable skill, are you healthy, do you share our western values, and maybe few others. In other words, do you merit being an American citizen because you can contribute to our nation's values?

Within their quota, yes.

Sadly, not at this time. It's not a very welcoming place for immigrants.

Not sure............. we have too many immigrants in general right now. I personally think we need to stop taking immigrants from any country for a while.