Where we come from is a question as old as mankind itself. There are countless numbers of religions, each with their own twist on the origins of earth and mankind, but one of the most highly visible debates would be creationism vs. evolution. Depending on where your beliefs lie, the Earth has been around somewhere in the neighborhood of 6,000 years to 4.5 billion years. One would tend to believe that this vast difference in time would make it impossible to have 2 "theories" that are so widely accepted. However this debate gives you just that. Each argument has its variations, however it comes down to either God created the Earth and all things in it as they are now or that life today has evolved from a single one-celled organism.
According to Genesis God created the Earth and all things in it in 7 days (actually six days and one day for a little R&R). There are within the belief wide ranges of explanations for the scientific discoveries in modern times. In 2000 the Presbyterian Church in America (PCA) created a committee to study the first three chapters of the Book of Genesis. What they found were 4 different views of creation days within their group. The first view is that God created the world in 6 consecutive days, with each day being a normal Earth calendar day (24 hours), any geological formations seen today (such as sedimentary rock formations with ten's of thousands of years of different layers) are said to have come from the Flood in Noah's time. The most generally accepted date of the creation of the Earth was October 22, 4004 B.C.E. Certain groups such as and especially Christian fundamentalists who believe in the inerrancy and literal interpretation of the Bible a ...