Prophet Muhammed (Pbuh) is not the founder of Islam. But he was the last and final Prophet and Messenger in a long line of Prophets and Messengers sent by the Almighty God to guide Mankind from darkness into light. Along this long line of Messengers we find the like of Noah, Abraham, Isaac, Jacob, Moses and Jesus (Peace be upon them all).
Like previous Prophets, Prophet Muhammed (Pbuh) called people towards the belief in One God and to worship Him alone. He taught the people to be just, kind, honest, to be trustworthy and merciful to others.
His life and teachings have been meticulously documented by thousands of historical sources, dating back to his companions.