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.
We have a problem not only with a six-day creation, but also with the age of the earth. Is the earth a few thousand years old or billions of years old (as scientists today insist)? (p. 121) On a preliminary reading RC Sproul would appear to be non-committal about the age of the earth. Although the Bible clearly says that the world was created in six days, it gives no date for the beginning of the work. It would be a mistake to become embroiled in too much controversy about the date of creation. (p. 121)