> it has nothing to do with the people who practice Islam
Good to hear, and I'm sorry if I misunderstood, but please make that clear. There are a lot of people who would smear others based on their religion; it's a serious issue and people will come to harm. Many want to Muslims' rights and even lives taken from them.
> everything to do with the texts that they consider holy
If you aren't talking about Muslims, than why is it relevant what the Islamic scriptures say?
> We don't claim that the founding fathers of the United States weren't racist just because we've abolished slavery, removed the 3/5 compromise and allowed all races the right to vote. We similarly can't claim that Islam does not advocate violence ...
The analogy with the Founding Fathers would be Mohammed. We similarly can't claim that Mohammed does not advocate violence*; it says nothing about a billion Muslims (Though we might: I don't know in non-sectarian historical terms who wrote the Quran. Muslims believe it is the exact words dictated by Allah - it's not Mohammed's words but Allah's. I know nothing about this question myself; I do know that historians believe the Jewish and Christian scriptures were written by many parties and not by the authors the believers claim.)
> blinded by political correctness
Please don't start name-calling or attributing beliefs to people you don't know. It's not productive and raises doubt about the good faith of everything else you say.
> that's what's written in the book that Christians pay blind allegiance to, so it's part of Christianity's true nature.
But Christians, like Muslims and everyone else, do not actually pay blind allegience to their scriptures. Some claim to and I would be surprised if more than a handful actually follows it in practice. Your definition of "true nature" is hard to support - what is "true"? What people do or what a book they mostly ignore says? And there are many, many widely differing interpretations about the truth of even that one book.