According to the Bible Adam lived a really long time. About 900 years or so.
Prove to me the Bible is reliable and this will be admissible.
Science does confirm that in a perfect world, we have that capability because we do regenerate and we regenerated faster when the earth was cleaner.
1. Science in no way confirms this.
2. The air and Earth were cleaner in, oh, 1457, let's say. People at that time, however, had a lifespan around half of what we do now. "Regenerated faster", eh?
How about that for scientific facts?
You have yet to state one.
Anyway, in 900 years, you could have an awful lot of kids.
Adam himself couldn't have had kids, being a man and all. Even if Eve had lived as long, you must first show she didn't go through menopause at age fifty, like every other average woman.
The Bible says Adam did have a lot of kids after Cain and Abel.
Again, demonstrate the Bible's authenticity.
In a perfect world, genetics of incest wouldn't have been a problem, especially if the copulation took place among people who were spread out so many years apart.
Perfect world or not, genetics are genetics, and incest would result in mutations and ill health. It also doesn't matter if a girl and her grandfather started having children; the sixty year age difference wouldn't affect the fact that their kids would be born with defects.
Just saying... hypothetically speaking.
Usually, hypothetical scenarios are plauisble.