Hinduism is the only religion which originations are unknown..but it's changed so many times too.First it was the Vedas,Vishnu,SHiva....etc.

THen it became Satya Sai(who is alive in India right now)......but anyways...you guys probably don't know about what i'm talking about

Hinduism maybe (not sure about islam)the only religion that didn't originate from other beliefs.