Islam was conceived and created as a kind of psychological brainwashing technique to transform the follower into a kind of zombie warrior working ceaselessly to spread the power of his master (at first Mohammed himself, later others depending on the Sunni/Shiite method of passing down leadership) across an ever widening area.
Mohammed was the greatest evil genius of all time and in comparison the great mass murderers of the 20th century are all 2nd rate.