Islam is not a "great" religion; it's the most successful cult in history. Jesus Christ is "the truth, the way and the life". Christianity is not an indictment of Judaism as Jesus was a practicing Jew.
Mohammad comes along 600 years later and redefines it all? Don't think so. God and Jesus never compelled faith in a single human being, yet mo demands compliance with his faith via the sword? Christianity calls on it's members to love your enemies as yourself; Islam calls on it's members to subjugate or kill infidels. Islam holds women to be mere property; the virgin Mary is esteemed as holy, righteous and good.
Christ died for our sins, Islam calls on it's members to ostracize, maim or kill the sinner.