I find the history of those libraries fascinating https://en.m.wikipedia.org/wiki/House_of_Wisdom.
Apparently he was a Yazidi Kurd; that's what the circumstantial evidence shows, and there's no other evidence AFAICT.
It says "Muslim engineer", which would be like saying Steve Jobs was a "Christian Engineer".
I note that Ismail al-Jazari's wikipedia article  describes him as muslim, and also an engineer -- which appellation are you concerned about here?
I'm unsure how that compares to describing Steve Jobs as either christian or an engineer, though I'd be struggling to try to substantiate either descriptor.
You mean like P. T. Barnum?
> "Brian, a longtime This American Life producer, started reporting this story more than three years ago, when he got an email from John with the subject line “John B McLemore lives in Shittown Alabama.”"
You can listen to the podcast which includes John McLemore himself and why he described it so.