Islam was spread by many ways, 1- by sending Muslims to ask other people to covert to Islam 2- by Muslim Merchants who helped a lot by there generosity, honesty & loyalty 3- by non-Muslims who...
there are radicals in the Islamic religion this is because they are ignorant to anything but the fact its there duty to kill in the name of Islam even though they don't have any reason to back up...
Islam was founded in Saudia Arabia Edit :Well, in a place that actually is in the borders of Saudi Arabia. The prophet was in Mecca when the revelation of the Quran began. Then he moved to Medina.