Theology has nothing to do with it.

Ethics doesn't change -- it's unethical to cheat, lie, and steal. Ethics is the constant and it by living by a code of ethics that makes us human AND humane.

Morals can change with religion and custom. In Sparta it was expected that youth would lie, cheat and steal. It was "wrong" to get caught. Temple prostitution was expected behavior, but that did not make it ethical behavior. Aztec religion said it was right, even imperative, to rip the heart out of a living human, but that did not make it ethical to do so.

What IS "corruption"? If "greasing the way" by bribes is accepted behavior in a given society, does that make those who take the bribes corrupt? What about those who offer the bribes? Because a custom is entrenched doesn't make it ethical OR necessarily moral (yes, the two can go hand-in-hand).

Enough ranting....