Why does an infallible, infinite God rely on fallible, limited creatures to spread His message?

Human beings are incredibly limited in intellect and capacity -- why does a God without apparent limits rely on such creatures to spread His message? If He's omnipotent and perfect, why not do it all Himself? Wouldn't He do a much better job of it than humans? The results of His so-called "plan" are hardly impressive -- mankind can't agree on who God is (Christ? Allah? Vishnu? Other?) and even among Christians, there are thousands of different denominations that do not completely see eye-to-eye with each other. Seems to me like God needs to fire His advisers.