The problem here was not in fact the individual's religion but the suspicion that he intended to work mischief against Israel its citizens. Incidentally, many countries already do refuse entry to holders of an Israeli passport, and have done so for decades. Has that ever bothered you?
Pro-Hadi forces recapture Yemen's al-Anad military and air base, hundreds of Houthis flee (Reuters)
from the article: American Jew refused entry to Israel on suspicion of converting to Islam