"Historically, the insistence on including caste among the criteria for Hinduism is not so innocent: it was part of the British 'divide and rule' strategy against the Freedom Movement. (...) These criteria were calculated to exclude the lowest castes and certain sects, regardless of their beliefs and Hindu practices... The aim was to fragment Hindu society: 'Given the upper caste character of the leaders of the Swadeshi movement, this 'test' was designed to encourage the detachment of low castes from the 'Hindu' category, reducing the numbers on whose behalf the upper castes claimed to speak.' The 'test' in effect implemented a suggestion by Muslim League leader Ameer Ali (1909) to detach the lower castes from the Hindu category. Ever since, it has remained a constant in anti-Hindu circles to maximize the importance of caste, and in Hindu Revivalist circles to work for its decrease in importance or even its ultimate abolition."
January 1, 1970
https://en.wikiquote.org/wiki/Caste_system_in_India