Yes, there is much that the Bible doesn't tell us. I blame the Council of Nicea and the Catholic church for editing many things out (or in, for that matter) and changing the language. But in looking at Jewish folklore and other accounts, it sounds like Eve wasn't Adam's first wife - Lilith was. I wonder if she is who Cain found and together they continued Satan's bloodline. I think the "fruit" that Eve tasted was actually sex with Lucifer. Cain and Able were half brothers, Adam being Able's father and Lucifer being Cain's father. Cain killing Able was the very first attempt to wipe out the lineage that Jesus was to be born through, but thankfully Seth was able to act as a replacement...