"I am not a bigot"
I hate to break this to you, but yes, you are a bigot. Your whole post here reeks of ignorance and hatred. Someone posting claims similar to yours about Jews or Catholics or even Mormons would be run out on a rail.
" IIRC, the Isnad is something like the Imprimatur in the Catholic Church, that attests to its accuracy. I don’t know the difference between a strong or weak hadith."
The isnad is the chain of narrators, the list of people who orally transmitted the hadith until it was put down in writing a couple of centuries after Muhammed (allegedly) said or did it. The problem with all oral traditions like this is that people have a tendency to exaggerate, forget important details, or just plain make things up somewhere along the way. Unlike a lot of religious traditions, where the stories of olde tend to be taken at face value, the Muslim scholars who compiled the hadith collections recognized this and spent a lot of time documenting the chain of narrators and studying their lives to determine if they are considered reliable or unreliable (and there are differing opinions among experts). Hadiths are considered to have varying degrees of reliability, and many that were considered unreliable were committed to paper nonetheless in the name of being comprehensive. Anti-Muslim propagandists refuse to take this into consideration, and simply dig up whatever evil-sounding hadiths they can find without any consideration of how authentic they are considered (whether this is deliberate or out of ignorance is something we must all judge for ourselves).
"This is something so very confusing about Islam – there is no single ‘church’ or Magisterium. I don’t know the distinctions in Sharia Law."
If you don't know the distinctions, then you should shut the fuck up. People like you spouting half-truths and lies about to demonize already despised minorities and advocating their extermination have a lot of blood on your hands, historically speaking, even when they didn't take a sword or gun into their own hands.
"Please give me some examples – specifics – when a Christian Church beheaded someone for adultery."
Henry VIII, founder and head of the Church of England, had two of his wives beheaded for adultery.
"If it wasn’t sanctioned by a church or happened in the last few centuries, it is not that relevant. There are bad people everywhere."
So all of the bad deeds done in the last fourteen centuries done by Muslims are relevant to Islam as a religion, but anything done by Christians beyond a hundred years ago is not relevant to Christianity. Nice double standard there.
"The thing about ISIS is that their actions seem to follow the commands from the Koran"
A judgement you are wholly unqualified to make.
"The US sent armies to Iraq not to defend against invasion, but to stop a perceived threat"
If you are dumb enough to believe that even with the benefit of the last 12 years of hindsight, that explains quite a bit.
"Why don’t you take a crack at explaining the meaning of Sura 9:29. I’d be interested in your perspective. "
I'm not qualified to proffer an explanation, as I'm not fluent in Qur'an Arabic (and I note that all the standard translations differ in wording, which would suggest different explanations). But I would certainly recommend if you have a real interest that you seek out someone who *is* genuinely qualified.