Christians not only regard Jesus as the son of God, the king of kings, but also the greatest man born. Muslims regard Prophet Muhammad as the perfect human being. Hindus likewise regard Shri Ram and Shri Krishna as role models. To the Sikhs their gurus are beyond the pale of criticism. In India the commonest cause of Hindu-Muslim riots are Hindus taking out processions through Muslims localities making it a point to disturb Muslims at prayer in their mosque.
Hatred is a stronger emotion than love.
Political leaders get a lot of mileage rousing communal passions against other communities.