Jawaharlal Nehru, in his book
Discovery of India, mentioned as under:
"Buddhism and Jainism were certainly not Hinduism or even the Vedic Dharma. Yet they arose in India and were integral parts of Indian life, culture and philosophy. A Buddhist or Jain, in India, is a hundred per cent product of Indian thought and culture, yet neither is a Hindu by faith. It is, therefore, entirely misleading to refer to Indian culture as Hindu culture."
On 3 September 1949, while addressing a public meeting at
Allahabad, the first Prime Minister of India,
Jawaharlal Nehru said:
"No doubt India has a vast majority of Hindus, but they could not forget the fact that there were also minorities - Muslims, Parsis, Christians, Sikhs and Jains. If India was understood as a Hindu Rashtra, it meant that the minorities were not cent percent citizens of this country."
You are wasting your time with idiots and ignorant Hindus. Sikhism, Jainism and Buddhism share a common cultural background just like Judaism, Christianity and Islam do . As a result they have certain concepts in common. However they are usually considered as distinct religions, again, just like the Abrahamic religions are.
The Abrahamic faiths all believe in one God, a soul and an afterlife. That doesnt make them the same religion. Neither does a shared idea of reincarnation make Buddhism and Hinduism the same thing. We know similarities and differences can be found in every religion