We are spiritual beings in a physical body. 7000 years ago, God created the entire universe as described in Genesis. He created everything in six, literal 24 hour days and on the seventh He rested. This is where we get the concept of a seven day week. Adam and Eve, the first people were created on the sixth day and were given the task of maintaining the earth. Adam made a decision of rebellion against God and thus brought sin into the world. 5000 years later God would send His only Son, Jesus Christ to live a perfect life so that he would be an acceptable substitute for our sin. When we are born we have a fallen sin nature that, if not corrected will damn us to an eternity of separation from God. It is only through faith in the saving work of Christ, who willingly sacrificed His life to atone for our sins, that we can correct our very nature.