Analysis of information sources in references of the Wikipedia article "Bengal" in English language version.
Population By Religion (%) Muslim 90.39 Hindu 8.54 Buddhist 0.60 Christian 0.37 Others 0.14
Also, we have the reference to 'Vangalam' in an inscription in the Vrihadeshwara temple at Tanjore in south India as one among the countries overrun by the Cholas. This is perhaps the earliest reference to Bengal as such.
[Husayn Shah pushed] its western frontier past Bihar up to Saran in Jaunpur ... when Sultan Husayn Shah Sharqi of Jaunpur fled to Bengal after being defeated in battle by Sultan Sikandar Lodhi of Delhi, the latter attacked Bengal in pursuit of the Jaunpur ruler. Unable to make any gains, Sikandar Lodhi returned home after concluding a peace treaty with the Bengal sultan.
The 1769-1770 famine in Bengal followed two years of erratic rainfall worsened by a smallpox epidemic.
in Samatata (South-east Bengal) where the Buddhist Khadaga dynasty ruled throughout the fifth, sixth and seventh centuries AD.
By the time Muhammad Bakhtiyar conquered northwestern Bengal in 1204
Population By Religion (%) Muslim 90.39 Hindu 8.54 Buddhist 0.60 Christian 0.37 Others 0.14