Listen: Jews and Christians aren’t all THAT different. Both believe that the Messiah will come, only for Christians it will be the second time. First of all, of all disputes to have, it seems to me it’s like arguing over whether or not God visited the 7-11 one extra time.
Anyway, it’s easily resolved: when he gets here, ask the the Messiah, “Hey, have you been here before?” Of course, then the “I told you so”s will begin. Oh- and if he answers, “I’ve always been here,” then he’s not a Messiah, but a Vorlon. And if it’s Ragnarok, then the Norwegians can really get a good laugh at the bunch of us. And if nothing happens, we can all continue arguing. What Fun!