Even though God created people to be like him, the world was evil, and full of hatred, selfishness, and greed.
People had forgotten how to appreciate God, and act like Him. They were too self-absorbed and selfish, they completely kicked Him out of their lives.
However, in this evil world, there was one person who still honored and appreciated the Lord. His name was Noah, and he and his family were the last kind, genuine, good people on Earth.
God came to Noah, and told him that he was flooding the earth since nobody loved Him anymore. He then told Noah to build a big boat so that he and his family could survive, them being the last kind people.
So Noah began constructing an ark large enough for him, two of each animal in the world, and food. Though people laughed at him, he knew God has asked him, so he kept on building.
After a long time of hardship, Noah and his family finished the ark. tHen all of the animals (tow of each) came into the boat. It had stalls for all of them, and food for the long journey.