You are gravely mistaken! It is not because they are Christians! It is because in Israel the cemeteries are EITHER Jewish, Christian or Muslim. If one does not have a Jewish mother (but a father or a grandfather) he cannot be buried at a Jewish cemetery. Only at the Goyim cemetery, which is "Christian".
They did not let me bury my husband at a cemetery, because his mother was not Jewish. Only in the desert, where the "Christians" are buried. If my husband was "Christian", he could not have immigrated to Israel at al!