Telling muslims Jesus was Jewish would have sent them on a murderous rampage..They were trying to save the country by hiding His Jewish heritage....Sarcasm......
Not necessarily Sarcasm. After all if the geographical region was referred to as Palestine at the time, as the Brits did last century and the Turks before them, and Jesus, one of the residents was Jewish, then the current palestinian arab fiction that Jews never lived there collapses.