You must not be doing your reading very well. It says that the master cannot beat the slave to death, if he does, there's a penalty, but so long as the slave can walk the following day. Secondly, the whole "Well God can do anything." argument is both horribly cliched and furthermore untrue. It says that God cannot tell a lie, which seems to me like quite a trifle thing to not be able to manage, plus proving contradictory to his claim of omnipotence, therefore sounding like one of the tall tales told by patients with Munchausen's disease.Just keep your eye open for such plot holes. Furthermore, wouldn't it have been an idea to keep humans unified rather than wait until there are more religions than stars in the Milky Way to attest to His existence. I know I'm exaggerating but you get the point. Also slavery is never of one's own volition or it wouldn't have been translated as 'slavery'.