Could it be possible that the people were Cain's brothers and sisters from Adam and Eve? I mean they lived thousands of years, which can mean........well, you know what I mean. 8)
Whatever the reason, the personal interpretations of others is not going to affect my faith, which is as essential as man having a soul. And that essential faith is in Jesus Christ, the Son of God. Spirit is spirit and flesh is flesh. No one tries to comprehend intangible things with tangible things. You do not compare compassion or perception (psychological concepts) with differential equations. Each category has its own logic, and spiritual truth is obvious.