The history of a religion traces the history of a people. Religion and belief form around the existing conditions in a peoples life.
The word Hindu and the religion know as Hinduism is not new. The faith or belief system is older than even the name given to it by the migrators, traders and even invaders coming from central Europe. The people of the Indus (Sindhu river) Valley Civilisation were called the Sindhoo people (from Sindhustan as early as the time of the Persian invasions if not earlier.It was the Portuguese & other European traders (later conquerors) that used the term Hindoo or Hindoostani to describe the people of the continent. Christian missionaries however identified the people with the religion, giving birth to the term – Hinduism.