why couldn't adam and eve be replaced after their default?

Something to consider is that we actually do have enough of Adam and Eves blood in us that we could still get humans up to those 500 year life spans if we mix and match correctly. It may take thousands of years but the authors seem to suggest that we can do it. So if there is an option where we can fix this mess on our own they are going to let us do it. This would require a eugenics program however, and right now that is socially a no-no. Through genetic engineering and somewhat carefull breeding we can get to the point where we have this supermen and women again. It works in Dogs right? lol. It can work in humans. You can breed out disease and short life spans in dogs just like you can in humans. People want to ignore that because it hurts our feelings but its the truth. You will also need some genetic engineering though as well.

People don't even consider this stuff as an option because of the social implications though. I don't even want to talk about it because I don't want to make people feel uncomfortable lol.

Michael they were undoubtedly genetically perfect. In fact on all advanced worlds with humans the life spans are going to be something like 500 years. Even Adam and Eves children lived exponentially longer lives in the hundreds of years. That is the goal for our human race as well. It's going to happen though regardless, because evolution never fails. We can go with the flow of evolution kicking and screaming over the unjust feeling we get or we can just face it. Lol either way its going to happen.

O lol its not that i dont agree with you because i do, im just saying in this leave it to god and evolution, we shouldn't tinker with it. In this current world, we could end up doing more damage then good. dont mean we can't strive for it. But if we have doctors and politicians, religous nuts even ethnic nut jobs, we could be destroying true genitc gems. Plus we wouldn't know what a perfect human would be like, GENETICALLY.

"The difficulty of executing such a radical program on Urantia consists in the absence of competent judges to pass upon the biologic fitness or unfitness of the individuals of your world races. Notwithstanding this obstacle, it seems that you ought to be able to agree upon the biologic disfellowshiping of your more markedly unfit, defective, degenerate, and antisocial stocks." (51:4.8 )

(1468.3) 133:0.3 One day while resting at lunch, about halfway to Tarentum, Ganid asked Jesus a direct question as to what he thought of India’s caste system. Said Jesus: “Though human beings differ in many ways, the one from another, before God and in the spiritual world all mortals stand on an equal footing. There are only two groups of mortals in the eyes of God: those who desire to do his will and those who do not. As the universe looks upon an inhabited world, it likewise discerns two great classes: those who know God and those who do not. Those who cannot know God are reckoned among the animals of any given realm. Mankind can appropriately be divided into many classes in accordance with differing qualifications, as they may be viewed physically, mentally, socially, vocationally, or morally, but as these different classes of mortals appear before the judgment bar of God, they stand on an equal footing; God is truly no respecter of persons. Although you cannot escape the recognition of differential human abilities and endowments in matters intellectual, social, and moral, you should make no such distinctions in the spiritual brotherhood of men when assembled for worship in the presence of God.”