Basically, this is a basic grammatical distinction like the difference between Christ and Christian. Same root, very different meaning.
I am happy that he supports Israel and raises money for Israel, but he twists himself into a pretzel to avoid having to proclaim or acknowledge that Jewish people need the salvation that comes through the repentence of sin, belief in the atoning sacrifice of Jesus Christ, and faith in Jesus Christ the Son of God. He tosses out essentials of the Christian faith so that he can hobnob with the Israeli PM and ambassador and important rabbis, and get lots of kudos from them. Meanwhile, our and their Savior is nowhere to be found, because His message causes friction and tension. Christian supporters of Israel and the Jewish people should not ignore or downgrade Jesus Christ.