Quote from OPTIONAL777:
Hinduism: Since Sanskrit is the oldest written language, as far as religion being written down, and as far as organized religion is concerned, it would be Hinduism. It is said that when Rama appeared, according to our calendar, was a million or so years ago (not sure of the exact date, but it's a long time!) And Krishna, God himself according to the Vedic scriptures, appeared here 5,000 years ago. Buddha, about 500 B.C., Jesus, about 2,000 years ago. If you go through the different religious book and study this question deeply, you will find out that Hinduism is the oldest religion of the world. There are no dates and facts, but its history is about more than 50000 thousands years ago.
The oldest written language ever found is Cuneiform script, not sanskrit. Cuniform emerged 5500 years ago(3500 B.C.) around the area of what is today modern day Iraq(which is around the area that the israelites(Jews) were from back then as the Garden of Eden is suspected to have been in southern Iraq also.
Sanskrit came a few thousand years later, AFTER egyptian hieroglyphs, AFTER Akkadian, AFTER hittite, AFTER canaanite.