What is the oldest surviving religion on earth?

[Nomad]

Christianity is just 2 thousand years old, where as Islam is just 1400 years old. Buddhism is little older than Christianity and Islam, it is 2600 years old. It is difficult to date Hinduism but the oldest Hindu scriptures are at least 5 thousand years old, which means Hinduism is older than that. Some people say Judaism is older bu there are no proof.