The Islamic religion first started by many prophets, which after a while was recreated and became Christianity and Judaism Catholic and stuff. So the last to invite people to Islam as prophet Mohammad (PBUH), and his religion has not been changed and tampered with. It also started in Mecca.
It started with many prophets, including Adam, Moses, and Jesus, but Muslims believe that the prophet's followers went astray, creating eventually turning into Christianity and Judaism. So many people believe that the true "founder" of Islam is Muhammad, who was given the final message of God in the form of the Quran. Also note that true Muslims believe that Christians and Jews believe in the same one God that they do.
ISlamic religion started in Saudi Arabia
The Roman Catholic church setup Islam to control the arabs in the middle east region.