My old neighborhood. Back in the sixties, way back then, we had a huge Arab population. Mostly Syrian and Lebanese.
They were mostly Christians, as you say. But I imagine the demographics have changed a lot in 50 years.
That being said, There were a lot of bomb threats and actual bombs in those days. One was left on the steps of the Lebanese Social Club, and horrible disabled the Bomb Squad officer who tried to disarm it. In West Roxbury, Roslindale, and neighboring Hyde Park there were several church burnings that were never solved.
My Jr. high school (The Shaw in West Roxbury) used to have regular Friday afternoon bomb threats. At the time we thought it was “hippies”, but looking back, I wonder....
And, in 1984, while in Israel, I was chatting with a West Bank Arab who said he had LOTS of friends and relatives in Roslindale.