Salaam, I am not sure if my questions have already been answered elsewhere on this forum. If they are, I would appreciate it if someone could point me to the specific thread. I have read the biography of Prohpet Mohammed, but was not sure what religion or faith he followed prior to his founding Islam. I could not find any definitive answer while researching on the Internet. Can someone shed some light on this? The second question pertains to what the origin/reason is for Muslims' belief in the Old Testament of Judaism and the New Testament of Christianity. Did Prophet Muhammad himself testify to his faith in them, and does the Quran mention them? Apart from the Quran, are the Old and New testaments also required to be read by practicing Muslims? I hope these questions don't offend any Muslims. Blame them on my curiosity.