Would apes be atheists?
You might think that human beings at least enjoy the advantage of being more generally intelligent. To test this idea, my colleagues and I recently administered an array of cognitive tests — the equivalent of nonverbal I.Q. tests — to adult chimpanzees and orangutans (two of our closest primate relatives) and to 2-year-old human children. As it turned out, the children were not more skillful overall. They performed about the same as the apes on the tests that measured how well they understood the physical world of space, quantities and causality. The children performed better only on tests that measured social skills: social learning, communicating and reading the intentions of others.
Or maybe we should test social intelligence, the only skill that makes us unique?