Not every ancient Christian was a creationist.  They did not all believe in Genesis 1.  They did not believe that "God saw creation was good."  Rather, they believed the universe was originally evil.  It resulted from a sudden burst of violent emotion - from arrogance, stupidity, and injustice.  One look at the cosmos justifies their opinion.  The universe is a vaste wasteland of burning gas and cold dead rock.  The universe is arrogant for being so large, and stupid for being a wasteland.    It is also unjust, for the only natural law is survival of the fittest, whereby violent unjust individuals kill and eat the peaceful.  They blasphemed the creator, but they never blasphemed Christ, for they believed Christ came to save us from the creator and his wicked angels.  These were the Gnostics.  Some of the Gnostic literature sounds metaphorically similar to the Big Bang.  The Gnostics were the most serious threat to Biblical creationism before Darwin.  In the mid 2^nd century, Gnostic Christians made a concerted effort to take over the congregation at Rome.  They must have come close, because testimony from their opponents survives, which tells of major upheaval in the churches.  They held a variety of anti-Genesis beliefs.  They believed that the universe was made by a stupid god called the demiurge.  Several ancient Christians thought the universe was the product of blundering angels.  Many of these Gnostics lived during or proximate to apostolic times.  Even the Apostle Paul held Gnostic opinions, which are not evident in English translation, but become clear when read in the Greek.  There is some evidence the uncle and cousin of Jesus taught Gnostic views.  For that matter, even Jesus is quoted in the Gnostic gospels, in support of their opinions.  The Gnostics believed that because the material world is a failure, therefore matter and flesh is despicable.  Although they rejected parts of the Old Testament, the Gnostics accepted much of the four Biblical gospels.  The Gnostics began to die out during the century before Constantine for certain reasons.  Unfortunately, the creationist perspective became dominate during the late 2^nd and 3^rd centuries, and remained so until Darwin.  All these assertions are backed up and footnoted in the links above.

Click to read more about how ancient Christian Gnosticism is compatible with evolution.

The creationist narrative in Genesis 1 is contradicted by many ancient Christian texts.  Instead of an Almighty Creator God, ancient Christian texts espouse that the universe is born from blind arrogance and stupidity.  The angels caused evolution to occur from species to species.  There are many gods, (or aliens?), and the Christian God is just one among them.  Satan the Devil writes scripture, and thus the Bible was polluted with Genesis 1.  Archaeology and modern scholarship demonstrate that Genesis is indeed corrupted.  Cavemen walk with Adam and Eve.  Esoteric prophecies reveal the coming of Christ, and also reveal the dark forces that govern the cosmos.  Such are the ancient Christian writings.

Science vindicates the truth of these ideas.  Evolution often happens too fast for Darwin's theory.  Gaps in the fossil record indicate that some kind of unnatural force acts together with natural selection.  Astrobiology reveals that intelligent life probably evolved long before us.  The fossil record reveals strange clues that aliens abducted species and transported them across oceans, and that DNA from diverse lineages was combined to spawn hybrid species.  Evidently, aliens influence evolution, and they are the gods of the world's religions. 

This is not fiction.  All these facts are thoroughly documented in the links above.