The following was written by Ptolemos of the Mahjarrat tribe before his disappearance in the early Fourth Age.
What can change the nature of a god? Such is an example of critical thinking and, when raised for consideration, can seem innocent by itself, but given the right context can spur a movement powerful enough to topple even the mightiest of empires. Therein lies the reason why the common man is dissuaded from thinking for themselves.
Take, for example, the origin of the chaos god. Once a mortal, Zamorak strove to challenge his master for reasons unknown until now. The Empty Lord was as empty as his title. Zamorak knew this, and so sought to bring about change. Betrayal was his answer to the question.
Yet even a newborn god can be proven wrong. In the aftermath of his treachery, the chaotic ideology Zamorak and his clergy preached rang as false as the promises of his former master. It had become but another means of control. Saradomin's pretentious dogma was no better, nor was Armadyl's screeching a suitable alternative in the years that followed, for no matter how attractive your restraints, a chain is still a chain.
Reflecting on the God Wars: It should not be a question of how it came to pass, but an instance of the wrong question being asked.
Nothing can change the nature of a god. But what can change the nature of a man? Belief.