The Bible tells us that the human race grew so wicked that God sent a worldwide flood to destroy it. He only found one righteous man, Noah, and he warned him to build an ark to save himself and his family from the flood. You can read the complete story here: Genesis 6-9
The Bible isn’t the only record of this flood. Other cultures all over the world have legends of a worldwide flood in which only a few humans were saved to repopulate the world. This article contains a list of some of these legends: Flood Legends From Around the World
The article begins with these words:
Native global flood stories are documented as history or legend in almost every region on earth. Old world missionaries reported their amazement at finding remote tribes already possessing legends with tremendous similarities to the Bible’s accounts of the worldwide flood. H.S. Bellamy in Moons, Myths and Men estimates that altogether there are over 500 Flood legends worldwide. Ancient civilizations such as (China, Babylonia, Wales, Russia, India, America, Hawaii, Scandinavia, Sumatra, Peru, and Polynesia) all have their own versions of a giant flood.
These flood tales are frequently linked by common elements that parallel the Biblical account including the warning of the coming flood, the construction of a boat in advance, the storage of animals, the inclusion of family, and the release of birds to determine if the water level had subsided. The overwhelming consistency among flood legends found in distant parts of the globe indicates they were derived from the same origin (the Bible’s record), but oral transcription has changed the details through time.
Some try to explain away these legends by claiming that they are just reports of local floods that occur all over the world. The problem with this explanation is that people normally escape from floods by leaving the area that is being flooded, not by building a boat. Building a boat would make sense only if there was no place you could go to escape the flood, which would be true only if the flood was worldwide.
In his second letter Peter predicted that people would deny the reality of the flood, in spite of the evidence for it.
Scoffers will come in the last days with scoffing, following their own sinful desires. They will say, “Where is the promise of his coming? For ever since the fathers fell asleep, all things are continuing as they were from the beginning of creation.”
For they deliberately overlook this fact, that the heavens existed long ago, and the earth was formed out of water and through water by the word of God, and that by means of these the world that then existed was deluged with water and perished.
2 Peter 3:3-6
This prophecy is being fulfilled at the present time. Nearly all historians and scientists assume the flood never took place and base their studies on what happened in the past on this assumption. Even a lot of Bible believing Christian deny the reality of the flood and believe that Noah’s flood was local rather than worldwide.
Does it really make any difference whether or not there was a flood? Scientists who try to measure the age of the earth need to know whether the geological formations they observe were formed by floods or by the normal effects of erosion. If there was no worldwide flood it would have taken millions of years for the earth to reach its present state; a flood could have brought about these conditions in a much shorter time, perhaps in the few thousand years the Bible indicates have elapsed since the creation. Here is an article that illustrates this fact. I recommend that you read the whole article and not just the part I quoted.
ScienceDaily: “Canyon Carved in Just Three Days in Texas Flood: Insight into Ancient Flood Events on Earth and Mars”With a headline worded as if written by a young-earther, the press release for a new study of Texas’s Canyon Lake Gorge reveals that an increasing number of scientists are coming to grips with catastrophic geology.
Young-earth scientists once caused a major controversy(indirectly) for arguing that Grand Canyon was formed rapidly. But recent events have given scientists of all stripes an appreciation for the geologic power of “a lot of water in a little time”—which contrasts with the commonly accepted model of “a little water in a lot of time,” used to explain such formations as Grand Canyon.
An organization called Answers in Genesis has almost finished a full sized replica of Noah’s ark in an effort to show that such a vessel could have been built. It is scheduled to be open to visitors on July 7. You can learn more about it here:
Perhaps it will help convince people of the reality of the flood.