Some of the biggest accomplices to Islamic terror are Palestinians who are (nominally) Christians, e.g. Nayef Hawatemah, George Habash, among others.
In fact, I think one of the co-founders of the Ba'ath Party was a Christian who hoped to create a pan-Arab nationalist, non-sectarian identity.
There is certainly a Stockholm Syndrome among Palestinian Christians.
That sounds correct to me. Palestinian Christians are sometimes opposed to Israel, which can come as a surprise to Americans accustomed to being sympathetic to Israel. Some of the older Arab terrorist organizations were socialist in foundation rather than Islamic and could easily have had 'Christian' members.
Radical Islamic terrorism grew out of different roots than the other groups, but may be making common cause or alliances of convenience.