Here's the real problem, which ties into the argument about original sin:
Turtlekid's religious arguments almost always involve taking stuff from the Old Testament literally. Most Christians aren't morons and don't literally interpret writings that, as should be quite obvious from some of the completely absurd things that happen in them, are allegorical in nature, particularly when referring to books like Genesis that completely go against common sense in addition to accepted scientific thought. Turtlekid's arguments are idiotic and asinine, and go against what most other Christians believe. And it should be clear by this point that he's not going to learn, so it's best to just ignore him and move along.
(I'm not saying some absurd stuff doesn't happen in the New Testament, but not nearly to the extent of what happens in the Old Testament. People didn't get turned into pillars of salt in the New Testament. Men didn't lose their strength because they got a haircut in the New Testament.)