There is only one religion, though there are a hundred versions of it.
George Bernard Shaw, Plays Pleasant and Unpleasant, Vol. II, preface (1898)
Dharmic, or Indian religions, are religions that originated in India or the Indian subcontinent. They are Hinduism, Jainism, Buddhism and Sikhism. These religions share many similarities in core beliefs, modes of worship, and associated practices due to their common history of origin, and some mutual influences. (from Wikipedia)