People can worship cow dung for all I care, but Islam is a GOVERNMENTAL Institution, somewhat akin to Shinto, and by its very nature advocates the overthrow of the COTUS and the US Government.
As far as Islamic governments and foreign terror go, I can see why Islam is so attractive to tyrants.
You have a bunch of poor, uneducated people with a centuries long grudge on their shoulder.. Just prod them to anger and use "Allah" as a vehicle to gain power and wealth for yourself.