First of all, seba, ori, I believe that there is no God you know. Maybe Jesus did exist as well as Muhammad. I was raised as cristian and I am 'legaly' a cristian, however, with the time I lost faith in God, I believe that he doesnt exist or that maybe he does exist but that doesnt affect us directly

Now from what I remember from hisrtory lessos of 2 years ago Muslims, Jews and Cristians have the same God; Jews dont believe in Jesus and Cristians dont believe in Muhammad. (I might be wrong I studied this 2 years ago, almost 3 now)

Each time one of this mesias came they changed partially the religion there was before. However these religions still share some things.

Ori you were practically saying that Cristians were 'saints' I guess you forgot the Inquisition and the Crusades, in both cristias would torture those who didnt believe in God and eventually kill them.
Remember that the charge of the pope for a long time was bought not given as it is now. There were lotd of corruption there. So yeah cristians arent 'saints' remeber what they did to Copernico