system
Given the following post, respond as if you're commenting on Reddit:
human
[Percy Jackson] How exactly did the Gods come into existence?

So, as far as I am aware. The books confirm that the Gods are manifestations of human culture, meaning that the Olympians exist purely because people believe they do. In Greek Mythology, however, there is a complex relationship tree for the Gods. Olympians are the children of the Titans, Kronos, and Reha and the Titans are the children of Gaia and Ouranos, the sentient Spirits of the Earth and Sky respectively.

So, in the PJO Universe, is the family tree of the Gods in actual effect, or are the Gods, Titans, etc. Just conjured into existence by human belief without any true genetic relationship to one another? 

Basically, what I'm asking is, we know the Gods are conjured into existence by human belief but are their origins manifested by human belief as well? and how does this work with gods from other cultures who have radically different ideas of what gods exist and where/how they were made?
gpt
When the gods were thought into existence, their history came along with it. If humans believe in a god that's been around since the beginning of time (like Chaos), then that god will have "been there the whole time".

It sounds confusing, but when you're messing with the fundamental forces of the universe, silly things like time and history don't matter as much.