Whatever an Aryan Prince Siddhartha Gautam who became Buddha had taught 2500 years in ancient Nepal and India no one can deny because scientifically it has proven as well spiritually anyone can experimented.
Also even by theologically Christians, Muslim and Hindus have borrowed and asserted that whatever Buddha said was right since their own masters have been asserting that Buddha prophesied about Maitreya Buddha was Mohammed as per Dr Zakir Naik from India a great Islamic world scholar, Christians have been asserting the same claiming about forthcoming Jesus and also proved by British scholars that Jesus was a Buddhist Monk and in Hinduism Buddha has been considered 9th incarnation of Lord Vishnu. These all prove that we should admire and follow Buddha teachings because he was a original real teacher and Gods of God, Prophets of Prophets who said there is NO God, No Heaven and Hell except in our mind.
Even from Hindu perspective I realise that there is NO Hell and Heaven as we think =D it is because in Hinduism there is a strong believe "जननी जन्मभूमिश्च स्वर्गादपि गरीयसी" this Sanskrit verse can be translated as "Mother and motherland are superior to Heaven." and this Sanskrit verse uttered by Lord Rama in the Hindu epic Ramayana. It is also the national motto of Nepal.
If mother and motherland are superior to Heaven that means there is NO heaven and hell since it cannot be superior of God land than human land which is earth and human being a Mother. Common sense can make this very clear if we have Brain to think in our head, heart to feel and hands to act or take action.