Well this is very wrong... no prophet ever teached Judaism or Chri 1:28 stianity for that mater, and Muhammed pbuh did teach Islam and Quran also mention word Islam... Also all messangers were spreading same message which is total submision to gods will and believing in one God which is direct translation of Arabic word Muslim, so if you take that to consideration then all propgets starting with Adam were actualy Muslims which means that Islam is the first religion on earth. Quran also testifies to this where it talks directly to Jews and Christians stating that only reason its revield is to confirm what you had before was the truth and to correct some of the miss understandings and corruption you (they) made along the ways....