doesn't atheism give us an account of how the world was created and what the purpose of life is?
I'll start with the second question first: how do you even know THAT life has a "purpose," let alone what that purpose might be? And once you've answered that, what, exactly, is the "purpose" of life?
To the first question, how the world was created. If you think a religious answer is going to be the correct one, how do you choose between these (or do you, like so many others, just assume that anybody who doesn't believe your fairy story are simply wrong?):
Creation from chaos
Enûma Eliš (Babylonian creation myth)
Greek cosmogonical myth
Jamshid
Korean creation narratives
Kumulipo
Leviathan (Book of Job 38–41 creation myth)
Mandé creation myth
Pangu
Raven in Creation
Serer creation myth
Sumerian creation myth
Tungusic creation myth
Unkulunkulu
Väinämöinen
Viracocha
Earth diver
Ainu creation myth
Cherokee creation myth
Iroquois creation myth
Väinämöinen
Yoruba creation myth
Ob-Ugric creation myth
Emergence
Hopi creation myth
Maya creation of the world myth
Diné Bahaneʼ (Navajo)
Zuni creation myth
Ex nihilo (out of nothing)
Debate between sheep and grain
Barton cylinder
Ancient Egyptian creation myths
Genesis creation myth (Judaism, Christianity and Islam)
Kabezya-Mpungu
Māori myths
Mbombo
Ngai
Popol Vuh
World parent
Coatlicue
Enûma Eliš
Greek cosmogonical myth
Heliopolis creation myth
Hiranyagarbha creation myth
Kumulipo
Rangi and Papa
Völuspá
Divine twins
Proto-Indo-European creation myths
Regional
Africa
Ancient Egyptian creation myths
Fon creation myth
Kaang creation story (Bushmen)
Kintu myth (Bugandan)
Mandé creation myth
Mbombo (Kuba, Bakuba or Bushongo/Boshongo)
Ngai (Kamba, Kikuyu and Maasai )
Serer creation myth (cosmogony of the Serer people of Senegal, the Gambia and Mauritania)
Unkulunkulu (Zulu)
Yoruba creation
Americas
Caribbean
Taíno creation myths
Mesoamerica
Coatlicue (Aztec)
Maya creation of the world myth
Popol Vuh (Quiché Mayan)
Mid North America
Anishinaabeg creation stories
Cherokee creation myth
Choctaw creation myth
Creek creation myth
Hopi creation myth
Kuterastan (Plains Apache)
Diné Bahaneʼ (Navajo)
Raven in Creation (Tlingit, Haida, and Tsimshian)
Zuni creation myth
South America
Legend of Trentren Vilu and Caicai Vilu (Chilean)
Viracocha (Incan)
Xolas (Chilean)
Asia
Central Asia
Ergenekon
Mongolian creation myth
Tungusic creation myth
East Asia
Ainu creation myth (Japan)
Au Co (Vietnamese)
Chinese creation myth
Japanese creation myth
Korean creation narratives
Nüwa (Chinese)
Pangu (Chinese)
Indian subcontinent
Ajativada
Buddhist cosmology
Folk Hindu creation myth
Hiranyagarbha creation (India)
Jainism and non-creationism (India)
Meitei mythology (India)
Mimamsa eternalism (India)
Nyaya-Vaisheshika atomic theory (India)
Samkhya-yoga theory (India)
Sanamahi creation myth (India)
Europe
Slavic creation myth
Theogony (Classical Greco-Roman)
Book of Invasions (Celtic, specifically Irish)
Väinämöinen (Finnish)
Völuspá (Norse)
Middle East
Debate between sheep and grain
Enûma Eliš (Babylonian)
Genesis creation myth (Hebrew)
Islamic creation myth (Arabic)
Leviathan (Book of Job 38-41 creation myth)
Mashya and Mashyana (Persian)
Sumerian creation myth
Pacific Islands/Oceanic
.
Areop-Enap (Nauruan)
Kumulipo (Hawaiian)
Māori myths (Māori)
Rangi and Papa (Māori)
Sureq Galigo (Buginese)
(Above list courtesy of Wikipedia)