Just a bit of a thought I had from a number of different quests here as well as my general knowledge of Warhammer Fantasy. I do not claim to be an expert and haven't seen anything personally to disprove this theory.
Anyway, the thought. So with the Lizardmen having the most "continuous" history from the beginning of the world outside of the (parts?)mixed with mythos, especially in regards to the Aethyr and Chaos gods. Ignoring various different species claims of former ruling such as the Fimir, Prometheans and Dragon Ogres are generally viewed as within this sort of pre-history, akin to dinosaurs to modern day.
We know the gods in general aren't really mentioned by the Lizardmen, outside of the Old Ones and their own.
However combining their knowledge and apparent blind spot, with how the Elves view gods and the general description most people agree on as the gods perceived by someone with significant knowledge. What if Gods are the Aethyric version of the Lizardmen?
Beings working on shattered history, with limited understanding and working from different ideas of how to accomplish the agreed upon goal? Using tools they sometimes barely understand and having to plumb them routinely for new insight.
They use what little remains after the great catastrophe, their tools were broken by chaos, so they sought new ones. Sheer magical grit wasn't enough to counter Chaos on their chosen plane.
They reached for something, anything, Chaos uses broken mortals to do their being(bidding?), to use their belief as tools to throw themselves against the Old Ones. Why couldn't the Gods do the same? Provide some in exchange for their belief, provide champions and heroic feats in your service, to show what you can do for them. Miracles on occasion are a small price for a continuous stream of power.
Something of a thought I had, wished to get some people to weigh in.