A religion itself has no power, except the power humans give it. Likewise, only spirits (and the thoughts/ideas/words/actions rooted from those spirits) can be considered "evil". Atheists, agnostics, and others often criticize religions, but ignore the personal human decision to adhere to or believe in a set of ideas, words/texts, etc.
Having said that... Islam is basically an adherence to a collection of texts rooted around Muhammad and whatever was "revealed" to him, beginning in the 7th century AD. It is the people who decided to use these beliefs and texts while spreading them during their conquests that gave prominence to the religion beginning in the middle east region of the world.
I don't feel Islam's founding makes any logical sense. Why, centuries after Jesus died and Christianity just happened to be spreading throughout Europe and the Mediterranean, etc. would the same God of Abraham, Isaac, and Jacob suddenly require a new "revelation" be given to a man with a questionable history, without previous warning of such a revelation written by any of the prophets in the Bible? Muhammad also allegedly descends from Ishmael, rather than Isaac, and there was nothing revealed to Muhammad that was even important enough to render him any relevancy.
Muslims reject the Trinity and divinity of Jesus, and of course, profess that salvation does not come through Jesus, but rather through a vague concept of "submission to God". In Islam, it's also incredibly blurry when it comes to "sin". In fact, it basically matches the default Deist view that God will simply weigh your sins and judge you accordingly. This directly contradicts the Biblical view that God requires a perfect sacrifice to completely atone for sins.
To me, political Islam has been used by certain Muslims to control people, using lies, sometimes by threat or force. It is this ambition of theirs that I find evil, and the religion itself seems founded on fraudulent and inconsistent premises, which I wish Muslims would question and investigate for themselves before blindly adhering to.