And it's absurd to think the Scriptures don't need interpreting.
Scripture is not open to man's interpretation. There is a right way to read Scripture and there are the rest of the ways to read Scripture and they are all wrong. Scripture is black and white, not a mix of grey.
Scripture interprets Scripture not man.
Your dismissal of the day-age interpretation is due to a fundamental misunderstanding of the theory. Do you really think that anyone believes that there was a 500 year day/night cycle?
Doesn't matter whether they believe it or not. If the day in Genesis is an age (which is generally based on the 1,000-year equals a day and a day equals 1,000 years vers) there would have to be an equal amount of light and an equal amount of darkness.
Again it's moot whether people believe it or not, and more than likely they don't because it blows holes in the argument. But if they understood the matter, they wouldn't hold to the day-age theory, because it isn't possible.
Read a few from each point of view and begin to understand the strengths and weaknesses of each theory.
Actually did a study on the various theories, although it has been some years ago.
And again there is one right answer despite what "man" thinks to be weaknesses in the answer, and then there are a number of wrong ideas
We must constantly be searching to make sure we are the holders of Truth and if we are found not to be then we must let Scripture change our views and not the other way around.