Genre of Genesis

Dont ask me, ask an authority of the Church, like the Haydock comment:

THE BOOK OF GENESIS. INTRODUCTION. https://johnblood.gitlab.io/haydock/id326.html The Hebrews now entitle all the Five Books of Moses, from the initial words, which originally were written like one continued word or verse; but the Septuagint have preferred to give the titles the most memorable occurrences of each work. On this occasion, the Creation of all things out of nothing, strikes us with peculiar force. We find a refutation of all the heathenish mythology, and of the world's eternity, which Aristotle endeavoured to establish. We behold the short reign of innocence, and the origin of sin and misery, the dispersion of nations, and the providence of God watching over his chosen people, till the death of Joseph, about the year 2369 (Usher) 2399 (Salien and Tirinus) B.C. 1631. We shall witness the same care in the other Books of Scripture, and adore his wisdom and goodness in preserving to himself faithful witnesses, and a true Holy Catholic Church, in all ages, even when the greatest corruption seemed to overspread the land. (Haydock) This Book is so called from its treating of the Generation, that is, of the Creation and the beginning of the world. The Hebrews call it Bereshith, from the word with which it begins. It contains not only the History of the Creation of the World, but also an account of its progress during the space of 2369 years, that is, until the death of Joseph.

Father George Leo Haydock did not put it in parallel, but in opposition to pagan mythology. He takes the timespan (here given for Masoretic / Vulgate chronology, not LXX) as a literal timespan./HGL