(Maybe they have heard of the following prophecy of the Bible:)

Zechariah 14:21 Yea, every pot in Jerusalem and in Judah shall be holiness unto the LORD of hosts: and all they that sacrifice shall come and take of them, and seethe therein: and in that day there shall be no more the Canaanite in the house of the LORD of hosts.

(Could they possibly know that Zechariah is speaking of a time when they will no longer be on the temple mount, for ever?)