I Think Abraham may have given birth to islam thrugh the slave women named Hagar.... God said "I will make a nation also unto Ishmael but my covenant shall be with Isaac"... Abraham's other son through his wife Sarah.. Isaac being the blood line of Gods chosen people.... Ishmael being otherwise..... (mho)
I think Muslims may agree with this.
Except, I mean to say, that they also believe that Islam is the “natural” religion everyone is when they are born. We are all born Muslims, they say. Thus the only one can be a different religion, is by apostatizing.