He was Christian, as were a number of the terrorists of the early 70s. Sirhan was a loner, but the PFLP was a Christian founded terrorist group to be reckoned with, a PLO member, responsible for a large number of hijackings and airport attacks in the late 60s and 70s. Suicide bombing didn't seem to catch on with them.
“Suicide bombing didn’t seem to catch on with them.
Without the virgins, it probably doesn’t seem like such a good idea.