To do Mohammed justice, his main attack was against the idolatries of Asia. Only he thought, just as the Arians did and just as the Unitarians do, that he could attack them better with a greater approximation to plain theism. What distinguishes his heresy from anything like an Arian or Albigensian heresy is that, as it sprang up on the borders of Christendom, it could spread outwards to a barbaric world.
The Islam that we know is a faith devoted to the worship of one God, as revealed through The Holy Qu'ran. It teaches the value and importance of charity, mercy, and peace.
We should be proud that our Prophet came into the world with the message of Islam to change it for the better, and not for the worse, or to keep things as they are.