What religious sect are most refugees out of Syria and Iraq that have gone into Europe and Turkey and Jordan?

They are Sunni Muslims that are refugees so they are not genocided in Syria by Assad, Iran and Russia.

What is ISIS?

ISIS is a very extreme reaction to the genociding of Sunni Muslims in Syria and Iraq by Shia Muslims in Iran, Iraq, and Syria.

However, it might be important to realize that Turkey, Saudi Arabia, Jordan etc. are what might be called ISIS Lite or Al Qaeda Lite.

So, for example, Turkey is becoming the new ISlamic State Caliphate for Sunni Muslims on earth at this time. So, ISIS soldiers will be 1 by 1 often joining the Turkish Army in preparation to fight Iran and Assad. This is what is going on on the ground.

Because of this Erdogan is trying to calm Putin down by making new agreements with him right now and to make relations better between Turkey and Russia in general.

This is so complicated it is just crazy. It is even much more complicated that I'm writing about here.

So, if you are trying to understand all this there are many elements going on here that I as an American might not ferret out unless I lived over there and maybe not even then.

So, Is Obama the founder of ISIS. That crazy! NO!
Is Hillary the founder of ISIS. Also, that's completely crazy!

But, are Sunni Muslims really irate and upset about the millions of Sunni Muslims now refugees from their own lands and jobs and businesses in Syria and Iraq? Are they upset about hundreds of thousands of people (Sunni Muslims) killed and genocided men, women and children?

You Bet!

And this anger is only just now getting started. It likely will get 10 to 20 to 100 times worse in the next century because of how badly Sunni Muslims are being genocided and turned into refugees if they don't die first.

There are more refugees now on earth than any times since world war II. This is very very serious and could destroy the balance of power in Europe and Turkey as it is already doing now. It also might destroy NATO, it also could destroy life on earth. Everything is in the balance right now because of Nuclear weapons.

And Trump doesn't seem to have a clue about what is actually going on here at all!

His solution might be to just nuke Assad and his army!

But, what is that going to accomplish really?

That would just make a permanent enemy of every relative of every person there that died that actually survived worldwide.

Trump would only be like a man with a stick hitting a  bee hive and then the bees  then sting (or kill)  everyone Nearby.