Ouch! Oh dear me...
First of all, that medieval Islam was sometimes more tolerant than medieval Christianity is a given.
After all, Reformation era Christians murdered each other by the millions, and on weekends went after Jews and Muslims.
But that was then.
And your comparison of today's Muslims to Nazi Germans is totally apt -- indeed some have argued that the Holocaust began with Muslim demands to their ally Hitler that if he wanted Middle East oil, he'd first have to get rid of his Jews.
And this is now:
The inheritors (if not progenitors) of the Nazi Holocaust -- radical Islam -- have worked since WWII to drive all non-Muslim populations (Jews, Christians, Hindus) out of Islam dominated countries.
In Egypt, for example, Copts were reduced from about 15% of the population 100 years ago to now maybe half that.
In short, Islam is becoming as intolerant as medieval Christianity used to be, while Christianity is today far more tolerant than Islam ever was.
Just to be clear, the italicized portion of my post was the last paragraph of the article posted; not my words.
In the middle ages while Islam was being sort of tolerant of Christianity in Europe, Islam was very busy butchering, enslaving and forcing conversions on Buddhists, Hindus, Jains, Zoroastrians if there were any left, animists and whatever few Christians or Jews in the rest of the world. The butchery in greater India, Indoneisa, and many other countries is unparalleled. Islam has only shown tolerance when it was in a weaker position.