Both Hinduism and Jainism claim to be oldest.
Earliest Vedas date back to 3500-3000 BC. Jains hold that Rishabha, their first Guru, Was mentioned in the earliest of Vedas.
However, It is possible that Sumerian and Egyptian religions may be older than both.
Events of Epic of Gilgamesh date back to 2600, and unification of upper and lower kingdoms of Egypt date back to around 3000 BC.
And some Chinese religions too may be older than others, Considering the records indicate of Xia Dynasty in 2100 BC and earlier cultures till 3000 BC.
The oldest religions, Like many of the first things humanity did, Must have come from the first river valley civilizations.
That gives you Nile, Tigris,Indus- Sarasvathi and Yellow rivers.
However, It may be that Pre Colombian Civilizations beat all of Eurasia and had organised religions around 6000 BC considering archaeological evidence of large scale structures that are probably of a religious nature.
But none of them exist now, Unlike Hinduism and Jainism. And I took the question to be about existing ones
Hope it helps
Buddhism is the oldest religion
But Hindu was before that during SRI RAMA and even b4 that
nice one buddy
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