The two religious groups involved in the Sepoy Mutiny were Hindu and Muslim soldiers in the British East India Company's army. This mutiny took place in 1857 and was a rebellion against British rule in India.
The Sepoy Rebellion was the uprising of natives (sepoys) of India against their British colonizers. Britain's attempt to "Westernize" India through Christianity, education, social policies, etc. was received as a direct threat to the traditional caste system already in place. The attempted implementations by the British were offensive to the native people whom reacted with surprising violence.
The BBC provides a good starting point for further research and deeper understanding.
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India and Great Britain were the two foes.
India's first was of independence was also called the Sepoy Mutiny because it was a mutiny of the Sepoys in the East India Company Army.