Rubuta ci gaba don wannan sakin layi - Musulunci a Tatarstan ya wanzu kafin ƙarni na goma, amma ya fara girma sosai a cikin 922, lokacin da mai mulkin Bulgar Almış ya koma addinin Islama. Wannan ya biyo bayan ƙaruwar aikin wa'azi a ƙasashen waje a Volga Bulgaria. Addinin Islama ya ci gaba da zama addini mafi rinjaye a lokacin mamayar Mongol
kuma daga baya Khanate na Kazan. A cikin 1552, Rasha ta mamaye yankin, ta kawo Tatars da Bashkirs a Tsakiyar Volga a cikin tsardom. A karkashin mulkin Rasha, an danne Musulunci na shekaru da yawa, da farko a lokacin Tsardom da Empire kuma daga baya a lokacin zamanin Soviet. A yau, Musulunci shine babban addini a Tatarstan, wanda kashi 53 cikin ɗari na kimanin mutane miliyan 3.8 suka bi, wanda ya sa ya zama addini mafi girma.