Ironically, Augustine wrote his book specifically to refute the arguments of pagans (and there actually were a lot of pagans at the time; he wasn't just tossing out insults to Christians who happened to disagree with him). He specifically showed that the world wasn't eternal, and that creation was a fact.
But he also knew that foolish people who thought that the Bible told them everything there was to know, were harming the Church by making up new doctrines.
Often, a non-Christian knows something about the earth, the heavens, and the other parts of the world, about the motions and orbits of the stars and even their sizes and distances, … and this knowledge he holds with certainty from reason and experience. It is thus offensive and disgraceful for an unbeliever to hear a Christian talk nonsense about such things, claiming that what he is saying is based in Scripture. We should do all we can to avoid such an embarrassing situation, which people see as ignorance in the Christian and laugh to scorn.
The shame is not so much that an ignorant person is laughed at, but rather that people outside the faith believe that we hold such opinions, and thus our teachings are rejected as ignorant and unlearned. If they find a Christian mistaken in a subject that they know well and hear him maintaining his foolish opinions as based on our teachings, how are they going to believe these teachings in matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven, when they think these teachings are filled with fallacies about facts which they have learnt from experience and reason.
Reckless and presumptuous expounders of Scripture bring about much harm when they are caught in their mischievous false opinions by those not bound by our sacred texts. And even more so when they then try to defend their rash and obviously untrue statements by quoting a shower of words from Scripture and even recite from memory passages which they think will support their case ‘without understanding either what they are saying or what they assert with such assurance.’ (1 Timothy 1:7)
St. Augustine, De Genisi ad litteram
This is the real damage YE creationism does to Christianity. You won't go to hell for being a creationist; God doesn't care if you approve of the way He created things. But if you promote YE creationism, you are setting an unnecessary obstacle in the way of people who would otherwise come to Him. And that is a grave matter, even if unintentional. Avoid it.
Jerimiah 1:5 Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations.
Before we have a body, we exist. Does that answer your question? Each of us has a spirit given directly by God, by which we become a living soul. Do you understand the meaning of "spirit" and "soul", as it pertains to man?
If you did, you'd have your answer.
To the point; you seem to now realize that mornings and evenings in the absence of a sun are logical absurdities. The text itself tells us that it's not a literal account. As Augustine pointed out.