Haven’t heard that one, but I have heard that the various Christian churches would be unified under the Pope before the Great Apostasy; it’s this unity that would attract the Jews. I’ve also heard Islam described as a a further decay of the Arian heresy, combined with some syncretism. So one might draw the syllogism that even Muslims would unify.
ALTERNATELY, I’ve read that in the rebuilt Temple, the Sabbath would be celebrated for three straight days. The Muslim Friday, Jewish Saturday and Christian Sunday?
If a pope should bring fire down from Heaven, Muslems, who put a great weight on miracles, would unite with whomever could do that.
I do need to emphasize to the Catholics on the board, this is not an attack upon devout Catholics, but there will be an apostasy within the Catholic Church that deceive the world.