Most everyone uses reason-it isn’t a rare skill. Reason can lead one to God for a number of reasons, though the spirit must draw one to Christ. A good old classical and symbolic logic text named The Art of Reasoning set out methods for distilling arguments…even so content of knowledge, learning and experience may take people to different destinations. It’s not like an arithmetic problem with one correct answer that can be found with a particular skill set.
Adam and Eve…
They had eternal life (in one direction) before the sin of disobedience. Elsewhere in Genesis it says to be fruitful and multiply. Maybe it’s where and when they had sex, although it doesn’t say that they had sex. Instead they became aware they were naked. Animals have no sense of that. Might have been an IQ test to determine if A and E were fully sentient. Consider the dog…does it knows it’s naked (unless it has a cute little sweater)?
Garrison Gibson: books and blog 