please let me know if i'm correct or completely wrong..
what makes up the hindu religion is vaishnavism and shaivism.
http://en.wikipedia.org/wiki/Hindu
The six traditional schools of Hindu philosophy (Samkhya, Yoga, Nyaya, Vaisheshika, Purva Mimamsa, Vedanta) define Astika [6] (believer, Hindu) as one who accepts the authority of the Vedas as supreme.