Once again you’re using flawed reasoning. That may very well be what Protestants think of creation, but unfortunately for Protestants, the Bible is Catholic, so you have to go by what the Catholic Church teaches about the creation, and this what she teaches:
The six days are symbolic. They are not literally just six days, six sequences of twenty-four hours, followed by ngihts. God did not literally rest after each day, nor did He literally rest after the last day; He is God, not man. The six days are meant to symbolically reveal the sacredness of the Sabbath, the Day of Rest, the seventh day; God finished creating Creation on the seventh day, and so rested from His work; Jews and Christians, too, must rest from work on the Day of the Lord, whereby they imitate God.
A day to God, in the biblical sense, means a thousand years, which is symbolic for meaning an indefinite amount of time. Likewise, to God a thousand years is but a day - so you can see why creation is depicted as unfolding in six days. The six days mean six thousand years, and since the number seven is symbolic for completition, the six thousand years means God took an immeasure amount of time to complete His work of creation. (This dosen’t mean we can’t measure the age of the Universe; it just means we can’t measure the age of the whole Creation) Hence to try to calculate the age of the Universe based on the number of days in Genesis, or to try to figure exactly when God created the Universe, is futile. The Bible is not meant to be as a read as a textbook of science. Even if science finds evidence that supports the six days of creation, it sitll won’t mean the Bible can be read as a textbook; it’s not a science book, it’s revelation.
Moreover, the reason God’s work is divided into days is to show that God created everything - light; darkness; sea; land; sky; celestial bodies; plants; animals; etc., that God’s command brings about creation (this ties in with the fall of man, when God’s command is not obeyed), that God created everything through His Word, that the culmination of the Universe is man, that out of evil God brights forth a greater good, that God provides man with all that he neeeds, and a number of other truths which are found in the Bible.
Finally, the six days of creation point to Jesus Christ, who is the Image of God. Throughout history the Lord had been preparing for His Son to come dwell among us, and when He came, the Lord sent the Holy Spirit to descend upon Him and said, “This is my beloved Son, with whom I am well pleased”. The Father revealed Jesus to be His Image, His Son, in whom and for whom He created everything, and He revealed Him to be the Messiah, the awaited King, who would usher in the days of redemption which the whole House of Israel had been waiting for for a very long time. The words “let us make man in our image and likeness” herald the coming of Jesus, who would restore man’s image, that is, the Image of God in man.
