Islam is the second-largest religion in the world. Founded by Muhammad in 570AD, Muslims believe that there is only one God, that Muhammad is his messenger. Their scriptures include the Quran, believed to be the verbatim word of God, and the teachings and example of Muhammad.
While every religion makes claims about being unique and having history behind them, the historical evidence for Christianity stands out. Compare the historicity of a number of world religions with Christianity, and it becomes evident that there's a significant difference.