Consult Thomas Jefferson on what it means to be an American and how to view the religious beliefs of your neighbors.
“But it does me no injury for my neighbor to say there are twenty gods or no God. It neither picks my pocket nor breaks my leg.”
-Thomas Jefferson, Notes on Virginia, 1782
What does he say about competing political systems? Was TJ pro-communism? Pro-theocracy? pro-dictatorship?
In a discussion of this type it is important to remember that islam is not a religion. It is a total politico-religious system covering every facet of human existance. It holds no distinction between religious law (for example the Catholics' "no meat on Fridays during Lent") and secular law.
Look up “the thirty year war”, both sides thought they were fighting for “true” Christianity. One side, at least, was wrong. The IRA thought themselves good Christians, and went to Church on Sunday - and tried to blow up innocent people to cause terror the other six days.
What they thought is immaterial, what the bible says is waht matters. "Thou shalt not murder" is pretty straight forward. After reading a bit on it (just a precursury glance) it seems that while there were some initial relgious tensions it was mostly fought about who would get to rule. In other words, it was just another war of succession.
Our founding virtues, as seen by Thomas Jefferson....
(Quote supporting religious freedom for all religions)-Thomas Jefferson, Autobiography, in reference to the Virginia Act for Religious Freedom
Again, islam is not only a religion. And even if it were, it commands behaviors that are counter to our founding precepts. Islam is anti-life, anti-liberty and anti-the pursuit of happiness. It recognizes no freedom of thought (or religion) that conflicts with the koran. It is 100% anti-American
Look up the term “freedom of conscience” as used by our founders.
An American is free to subscribe to any political or religious belief that suits them. It is not belief or speech that can be prosecuted - only actions.
If you think Thomas Jefferson was ignorant of Islam and the political system and laws that rise from it - you are wrong.