I'm inclined to believe that it's not so much the religion that foments radical terrorism but rather the political and economic fabric of society in the middle east that is responsible. I would point to the fact that in mostly prosperous, stable societies radical islamists are about as rare as right wing nutters that bomb abortion clinics or shoot up AAME churches. The recent bombings in Paris and attacks in the US are being inspired by the radicals in poorer countries, not the Mosque around the corner.
The middle east has been and will continue to be a hotbed of government corruption and economic instability that sparks isolationist, fundamentalist thinking.
It's alarming that in the US and Britain and other western countries, the political trend is to feed into the same fear and economic anxiety that the Imams in Iran are using to whip up unrest. Brexit and "I'm gonna build a wall," pander to the same base fears of people on the margins of society.
The comparison to Nazism is interesting inasmuch as the National Socialists ran a campaign of fear and hatred of the Jews at a time when Germany was on the ropes economically. Sounds to me alot like the Republican Party today.
Just my two cents.