Question

Why the revolt of 1857 was based on religious causes

Answer 1

The Indian Rebellion of 1857 had diverse political, economic, military, religious and social causes. ... The spark that led to a mutiny in several sepoy companies was the issue of new gunpowder cartridges for the Enfield rifle in February, 1857. A rumour was spread that the cartridges were made from cow and pig fat.

Answer 2

because the rumour has spread to several sepoy companies that a new gunpowder for rifles that cartridges are made up of cows and pigs fats