Major premise, a mazhab is a cultural manifestation of a way of life i.e., deen. Deen has certain principles without any manifestation that is rendered useless. When we speak about “La Iqra ha fid Din.” Deen is to be distinguished in this form as completely a bigger umbrella under which “Sharia” (the law), “Fiqh” (the understanding and school of thought), and “Mazhab” (the customary practices) comes. For being a Muslim or follower of Islam, you should have a basic belief that Allah is God, and Muhammad peace be upon him is his last prophet, and no other prophet will come after him. If anyone differs from this belief, then he is rejecting Islam’s basic belief and not able to say him as part of Islam, but he can label himself any believer other than Muslim.