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
develop between 500 BCE and 300 CE, after the end of the Vedic period (1500 to 500 BCE), and flourished in the medieval period, with the decline of Buddhism in India. 
Although Hinduism contains a broad range of philosophies, it is linked by shared concepts, recognisable rituals, cosmology, shared textual resources, and pilgrimage to sacred sites. Hindu texts are classified into Śruti ("heard") and Smṛti ("remembered"). These texts discuss theology, philosophy, mythology, Vedic yajna,
Hindus
Hindus () are persons who regard themselves as culturally, ethnically, or religiously adhering to aspects of Hinduism. Historically, the term has also been used as a geographical, cultural, and later religious identifier for people living in the "Hind" (Indian subcontinent). 
The historical meaning of the term "Hindu" has evolved with time. Starting with the Persian and Greek references to the land of the Indus in the 1st millennium BCE through the texts of the medieval era, the term Hindu implied a