Every belief system has an account of origins, and atheism is no exception. Narratives for atheists include the Big Bang (origin of the universe) and evolution (origin of variety and complexity of living organisms). Instead of man being formed out of the dust of the ground by God, man is formed out of the dust of the ground by evolution. It never ceases to amaze how those who espouse naturalism can poke fun at the Biblical account of origins, and yet be unable to see the ridiculous nature of their own position.
One who has studied a great deal about mythology is Raphael Madu. In his work African Symbols, Proverbs, and Myths: the Hermeneutics of Destiny he refers to earlier work by Earl MacCormac in Metaphor and Myth in Science and Religion, and Madu points out (footnote, page 96):
Because men have traditionally assumed a dichotomy between myth and science, it might be shocking to talk of scientific myths… Scientific explanations are known for being falsifiable and thus temporary, but to forget these qualities of science and assume that they are absolute and final, is to create a myth. The dissimilarity between religious and scientific myths is largely on the level of content. While the former are replete with descriptions of legendary heroes and deities, the latter are filled with mathematical symbols and references.