Uttar Pradesh is the most populous state of India and has a diverse population of many religions & communities. At the census 2011, out of 19.98 Crore population, around 16 crores (79.73%) have returned themselves as followers of Hindu religion, 3.85 crores (19.26%) as Muslims or the followers of Islam, 6.44 Lakhs (0.32%) as Sikh, 3.56 lakhs (0.18%) as Christians, 2.13 lakhs (0.11%) are Jain and 2 Lakhs (0.10%) as Buddhists. In addition 0.29% Stated as no religion & 0.01% are other religions.
Source: Census 2011
also read Population of Uttar Pradesh