That is no difficulty. We simply recognize that words are symbols. The real meaning of the word, days, as used in the Bible, is eons. God built the world in 6 eons. The misunderstanding is reestablished.
Most people are pleased.
And a word or two about God. Someone who believes there is a God is a theist. Someone who believes there is no God is an atheist. Atheists and theists do not agree, just because of the symbol of God. Each of them feels superior to the other.