Jesus preached "A little yeast leavens the whole lump."
Islam is a lie, a fuzzy undefined lie that can be adjusted to look like the culture in which it is put. I call this a mirage.
The core accusation is the cause of sin in the world is the wrong corrupt religion. The dream is with the right religion, Islam everything will be ok. Because this is never defined, any muslim can point at anything non-muslim and say, that is the cause, reject that. The whole community then responds in obedience because there is no basis for a counter argument.
Now the core "right" way of running the community is black and white. Adultery, death, homosexuality, death, murder, death, theft, hands chopped off. Now in pure law old testament terms people would say, harsh, but it is there in the bible.
But unbelief, apostacy, and blasphemy is also death. An apostate becomes not being the right type of muslim, or praying the wrong way. So the logical noose goes tighter and the murders and mayhem increase, innocents accused of blasphemy, apostacy for any and every reason, summarily murdered with no come back.
Now what stops the ordinary muslim falling into this pit of logic? It is nuts and so counter to life experience. But imagine you get a little depressed and unhappy with your social group, a little paranoid, then wack, suddenly it all makes sense, why did you not see it before. They are all guilty of blasphemy and deserve to die.
Now if I can take you logically from normal life to 100% Isis in 10 sentences, you need to take seriously this idiology is dangerous and without foundation. Islam survives because it refuses to define morality, law, love, respect, righteousness, sin, God, Jesus properly, so if you argue with it, they twist it to say whatever looks nice. But it is only 50% nice, not real.
And once you challenge it you have declared yourself an enemy, therefore of Satan, and worthy of death. So do not ever suggest this idiology is anything but dangerous.
An example of this reality is read the stories of girls who at 16 said to their father they did not want to marry the man they were being set up for. Suddenly their nice family became violent, aggressive and their life was in danger. Why? Because a father can kill a daughter with no problem before God. And in their eyes, that is what matters.