We do not know where Moses’ Mount Sinai was. It may have been a still-active volcano. The present monastery of Sinai has always been a Christian site; it goes back certainly to the fourth century AD, and perhaps to about 200 years before. But even that was 1,450 years after Moses came down from the mountain. It is likely that, after the Israelites settled in Canaan, the Mosaic Sinai remained a pilgrimage site for generations. But the tradition eventually lapsed and the site fell out of memory, and it is most improbable that the early Christians went to the right place.