You are falling for their BS.
The evidence of the real stand of things are muslims, that are fighting against salafists.
In this way You have nothing to say, that muslims are supporting ISIS.
The BS is Your font of text extraction equilibrists for ignorant people in questions of modern Islamic World.
You have specified text about all the questions in criminal activity of ISIS from muslim point of view with the reference to text of Quran and the Modern Rules and the Stand of things in Islam.
The letter explain that being "non muslim" rappresent no crime, even being in appartenance to other religions rappresent no crime too.
(The exceptions from this are cases of witchcraft, Satanism, Sexual disorders. I have few data how they deal an all that cases.)
Try to ask to some expert where is the trick of insane diffamation in Your font, if to You is not enough so clear text of letter.

No idea, who have the time to make it for free and online.