I have a friend who is Hindu
I am Hindu myself! There's a pretty large group of us, we culturally, ethnically or religiously adhere to the aspects of Hinduism! 
Uhmnnn!So what region mainly practice such religion?
Traditionally, most Hindus hail from South Asian areas. We have since spread all across the world.
Good! So who is the originator?
It's hard to say, but there were Persian and Greek references to the land of Indus in the 1st millennium BC! Back then, most Hindus lived on the Indian subcontinent around the Indus or Sindhu river.
So what's your belief as a Hindu faithful
It's a very broad range of philosophies, but most share certain concepts, rituals and pilgrimage to sacred sites.