Al and Jay say that there were no coins minted during the time of Mohammad 620- 660 AD in Mecca.  The coins found in that time period had Byzantian crosses or Zoroastrian temples on them and they were found in Jordan, Syria and Lebanon. In 680 AD when Abd Al- Malik defeats the Byzantian ,  he introduces the Shahadah.  He was an anti trinitarian Christian. Mohammad's name was introduced on the coins during Abd- Al Malik reign in 710 AD.  The rock inscription were found in the 7th century, way north of Mecca between 640-740 AD. . None of the inscription was found in Mecca or Medina as the S.I.N. claims.