The Muslims, Jews and Christians share the same past and mostly up to Jesus they had the same prophets, same biblical information, same beliefs as we do.
They believe that Jesus was a great prophet but like the Jews they don't believe that Jesus was the Son of G*d.
Right there is where Christian, Jewish and Muslim religions branch off.
Where we are also different from them, we are not a Semetic people while both Jews and Arabs are. They are actually brothers.
From what I read in the Koran, their religion is one of peace and harmony. This dark evil stuff that some of them do in the name of Islam is not really Islam but a twisted b*st**d religion/excuse for money/power branching off from Islam.
Not that they are the only ones..just about all religions have had similar branches at one time or another where false prophets have convinced enough of their followers to do evil in the name of the twisted, self serving teachings of their religions, to give their false prophets (even insane prophets) money and power.