On that basis, Wansbrough developed the theory parts of which he qualified as "conjectural "provisional" and "tentative and emphatically provisional", as it implied (in the words of historian Herbert Berg) that "neither the Quran nor Islam is a product of Muhammad or even Arabia", nor were the original Arab conquerors of the Umayyad empire actual Muslims. he postulated that Islam did not come into being as a new religion on its own but derived from conflicts of various Jewish-Christian sects and from the need for a (fixed) sacred scripture upon which to base the Abbasid code of law: "The employment of scriptural "Shawahid" in halakhic controversy required a fixed and unambiguous text of revelation ... the result was the Quranic canon.