The four madhhabs — Hanafi, Maliki, Shafi'i, Hanbali — are schools of legal method, not sects, and all four have been recognized as equally valid for over a thousand years. A Muslim may follow any of them, and they differ on real questions (how to position the hands in prayer, the details of contracts, whether a woman needs a guardian to marry). That an orthodoxy could institutionalize four correct answers is one of the more remarkable facts about Islamic intellectual history, and modern movements that reject the schools entirely are the genuine innovation.