The name "Hindu" was given by the British for the people that lived across the Indus river. Modern day "Hinduism" has been around for very very long time. It is one of the oldest religion of the world. There was no Buddhism, Hinduism or Muslimism in the old days. There was only one "dharma" - sanatana dharma. Buddha also advocated for the same religion, Buddha did not say it is a new religion, he said that he preaches dharma that is "sanatana". The modern day "Hinduism" has been defined and limited after the Muslim invasion more so after the British invasion. People should get the facts straight before hammering on the religion.