The Hajj and its pagan origin.

[Sam_777]

but Christians and Jews were also participating in the Hajj prior to the life of the Prophet.

http://forums.catholic-questions.org/images/icons/icon13.gif, objection here, no reference of whatsoever in the Bible tells Christians or Jews to pilgrimage to Mecca!, however, if some Christians and Jews made Kaaba as a Church or Synagogue then that because Kaaba was a common place for gathering (i.e, down-town).