Like all mythology, fables, and fairy tales, bible stories were made up by priests to explain what prehistoric (before writing was invented) peoples wanted to know about themselves and their world. The stories were also moral lessons to encourage proper social and political behavior. They preceded scientific discoveries and relied on absolute faith in the priests' pronouncements.
The Garden of Eden story is common to various world religions. The basics are that pre-cognizant humans evolving into thinking beings as their brains developed. No conflict between multiple religions and science so far. Humans were without "knowlege" of good and evil, or of anything else for that matter.
There came a time when the original humans developed physically and mentally enough that they were ready for "knowledge", which the authors of the Bible treat as forbidden and evil. Very strange that God would not want his creations to develop and grow to be capable of logic and choice and advancing past the non-sentient animal stage. However, the authors of the Bible (men, of course) indict Eve with seducing poor Adam into eating the forbidden apple and gaining a modicum of logic. Adam's bite of the apple was probably a small one since he never gained too much brain power and still is governed mostly by his gonads.
So far, creationism and evolution are not logically in conflict. Neither can really prove how life was created, but it was anyway.
The Bible doesn't mention whether Adam and Eve had any children while they were in the Garden of Eden. That would imply fornication, which the authors of the Bible avoided discussing until after "the fall". On their eviction, Adam and Eve procreated like crazy. If they were the first humans created, then their children and/or they must have indulged in incest to populate the rest of the Bible. There are lots of "begats" in the rest of Genesis and it's a wonder that the gene pool developed from so few originals.
But it didn't really. After lots of begats, "God saw that the wickedness of man was great in the earth... and the Lord said, I will destroy man whom I have created from the face of the earth..."* (except for Noah, his wife, their three sons, their wives, and two of each animal and so forth). And so came the great flood wiping out all of Adam and Eve's descendants with the exception of Noah and his family. Noah lived for another 350 years after the flood for a total of 950 before he died. Wow!
Tune in again for more of Genesis; Abraham, Isaac, Esau, and Jacob.
*King James version