Scientists first make observations that raise a particular question. In order to explain the observed phenomenon, they develop a number of possible explanations, or hypotheses. This is the inductive part of science, observing and constructing plausible arguments for why an event occurred.
As indicated earlier, the Bible does not fix the age of the earth, contrary to the claims of Answers in Genesis. Historically, their claim comes from the work of James Ussher, Bishop in the Church of Ireland, from 1625 to 1656.
The Earth is around 4 billion years old. If you believe the Earth is 6000 years old based on just what is written in the Bible, then I can't argue with that. Dr Jonathan Sarfati responds: It makes sense to trust the One who was there, not circumstantial evidence from people who werenât. See The Parable of the Candle.