Although I had had doubts since I was in my teens about the divinity of Islamic teachings, the straw that broke camel's back was reading about what is really in Quran and what Muhammad did in his Medina stay through websites like FaithFreedom.org and books by Ibn Warraq and Anwar Shaikh. Particularly disgusting was his massacre of all Quraiza tribesmen and taking beautiful Rehana - the wife of the tribe leader - to bed the same night; and sex with 17 year old Safia after killing her husband Kinana and his people in Khyber. Other disturbing revelations were Muhammad's marriage to 6 year old Ayesha, his sleeping with slave girls and concubines,his assassinations of his critics, the Quran's declaration of violence against non-Muslims, raping of captive women and slaves & looting of non Muslims as pious act worthy of paradise. That left no doubt in my mind that Islam is not divine, it is a dangerous cult.
Ayesha Ahmed, India, now an atheist