Evolutionists assert that Earth is billions of years old, so we expect some to try to interpret Scripture to accommodate an old earth. How might they do so?
Primarily by allegorizing the Creation myth and considering the days of Creation to be geologic ages, making each day as long as we like. The general pattern of a lifeless earth (Day 1), then plants (Day 3), followed by sea creatures (Day 5), land animals and finally Man (Day 6) seems to more or less follow evolutionary sequence. It’s called the Day-Age Theory.
Obvious problems include the fact that the planet itself is created before light (Day 1), Earth, light and plants (Days 1-3) all appear before the sun, moon and stars (Day 4), birds (Day 5) come before all land animals (Day 6), and God blessing the 7th Day to start an ongoing 7-day rest cycle based on Him completing Creation in 6 days. (Ex 20:11)
Further, Adam is said to be the very first man (1Co 15:45) and his life-span is stated explicitly (Ge 5:5), along with those of all the antediluvian patriarchs (8-30) in the lineage of Christ (Lk 3:36-38), placing Creation around 4000 BCE.
So, to be consistent, we can’t simply allegorize the Creation account in isolation, we end up corrupting the integrity of Scripture throughout; its authors evidently understood the Creation account literally: if they were mistaken, they weren’t inspired. If the Day-Age Theory had any real basis in scripture, it’s difficult to explain why it appeared so late in history, only in the last 200 years. The interpretation thus appears forced in order to accommodate recent, opposing scientific claims.
Another approach, the Gap-Theory, allows for a literal interpretation of the Creation account, yet postulates a large gap between the first two verses; between the creation of the planet (Ge 1:1) and it being found formless and void. (2) This view harmonizes nicely with most scripture while providing for any age of the earth we like. However, it’s also inconsistent with the Sabbath Command (Ex 20:11), and begs the question of whether an old planet with no light or atmosphere, no sun or moon or stars, or any life form whatever as we know it, helps much to square the Word with evolutionary claims. What’s the point then?
We all choose an authority for determining what’s true, and if we earnestly want to know the truth we should insist on having no contradictions in our world view, no inconsistencies. If we accept God’s Word as Truth, in it’s entirety (Ps 119:160), then we must try to interpret it consistently, and discount unverified scientific claims, such as evolution, which contradict it. (1Ti 6:20-21)