What is the creation story according to christians?

The detailed answer to this question can be found in the first chapter of the first book of the Bible: Genesis. In short, Christians believe that God (Elohim, Yahweh, Jehovah, etc.) created the universe and everything that exists in six days, and that God rested on the seventh day.

1.) On the first day God created light and separated it from darkness. The light was called day and the dark was called night.

2.) On the second day God created the firmament (Heaven or Atmosphere) and separated it from the oceans.

3.) On the third day God created the land (it was divided from the seas) and vegetation was grown.

4.) On the fourth day God created the sun, moon, and stars to fill the sky. The sun was used to light the day and the moon was used to light the night.

5.) On the fifth day God created the sea creatures to fill the oceans, and the birds to fill the skies.

6.) On the sixth day God created the animals to fill the lands, and man was created as the pinnacle of creation; he was purposed to populate and subdue the earth.

7.) On the seventh day God rested from all His work.

*The length of each day is debated by theologians. Some believe the days are literal 24 hr. periods (Young-Earth), while others believe that each day is figurative, representing an unknown length of time (Old-Earth). This distinction does not affect the belief that one God created all that exists.