Question 2. From whom did it originate and when?
Unlike the other religions of the world, Hinduism did not originate with any single prophet or at a particular period of human history.
Its uniqueness lies in its being based on the super conscious experiences and spiritual realizations of a galaxy of saints, sages and seers, each of whom could claim prophet hood.
Built on such a firm foundation of spiritual experiences which are verifiable, the Hindu religious tradition has been flowing continuously like the river Ganga for several millennia. That is why it has been designated as Sanatana dharma.