Most probably Finno-Ugrics comprised the bulk of Kazan Khanate population, being only partially touched by the Turkic and Islamic culture. Their mass conversion to Islam happened later. At least its well-documented part starts around the 18th c, long after the Russian conquest
That's a poorly known and somewhat counterintuitive story. Mass Islamization of the Middle Volga happened not under the Muslim power as one could expect, but centuries later, when Islam was a second class and persecuted religion of the Muscovite Tsardom and the Russian Empire
I'll go into details in a next thread on how Volga became Muslim. The end
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