National Church of Nigeria, AbujaNigerian states that implement some form of sharia law (in green)Nigeria has the largest Muslim population in sub-Saharan Africa. The vast majority of Muslims in Nigeria are Sunni belonging to the Maliki school of jurisprudence; however, a sizeable minority also belongs to Shafi Madhhab. A large number of Sunni Muslims are members of Sufi brotherhoods. Most Sufis follow the Qadiriyya, Tijaniyyah and/or the Mouride movements. A significant Shia minority exists. Some northern states have incorporated Sharia law into their previously secular legal systems, which has brought about some controversy. Kano State has sought to incorporate Sharia law into its constitution. The majority of Quranists follow the Kalo Kato or Quraniyyun movement. There are also Ahmadiyya and Mahdiyya minorities, as well as followers of the Baháʼí Faith.