I am sorry if I ****** you. I did not mean that.
As far as I know bible (complete) contains 73 books but protestants only believe in 66 books as they think that 7 books of OT are doubtful. So whatever group you belong to, this is a huge difference.
Only difference between Sunni and Shia is that Shia believe that they are direct descendants of Mohammed (pbuh) so that makes them more important. Where Islam does not believe in family or back ground when it comes to be classed good or bad. Otherwise at the time when slavery was so widespread, an African slave like Bilal ibne Rabah wouldn�t have become the head of Islamic army and respected by who were once his masters. Otherwise there is no difference in religious belief.
http://en.wikipedia.org/wiki/Bilal_ibn_Ribah