My research indicates Jesus wasn't supposed to talk about his divine nature. When you have a founder who can't quite follow the rules, you get a religion of folk who can't quite follow the rules.
Let's talk a bit about ad hominem. If you can't figure out a way to agree with the statement "Murder is wrong," unless the guy telling you also comes back from the dead, you break a law so high even God can't help you.
Ye Olde Booke has lots of good advice. However, there's a profoundly prosaic reason behind Jesus' sin. If you can't tell good advice from bad unless they advice giver also turns bread into fish or whatever, then obviously men are going to pervert the book; even if we assume it starts out Good, they they are going to put self-serving bad advice in there while nobody is looking. Precisely because you can't tell the difference.
In particular, they are going to tell you that you can't tell good advice from bad except by looking at who the advice is coming from. (See also: localism.)