The document discusses different views on the historicity of Muhammad's life and career. It describes three main approaches: the traditional view that accepts Islamic sources, the extreme critical view that rejects them, and the critical view that sifts the sources and uses common sense to make some inferences. It then provides details from Islamic sources on Muhammad's early life in Mecca, his revelation experience, opposition he faced, hijra to Medina, battles against Meccan forces, gradual establishment of authority, and family life including his wives.