My answer may not answer your question, I do not know if my answer will be viewed as off-topic, but I saw your thread from a perspective, and I will answer from that. It may seem off-topic, but it touches the thing from where this thread came, at least from the lens of my experience.
From what I understood, you think of the Gods as being ‘up there’, and wonder if they will ‘come back’.If i am right. Start summoning and doing God rituals, just have a reason behind them before doing them, it will make you feel the Gods are always here.
So there is no “come back” to begin with. It may be in another sense, or on another level, or from another understanding; the perspective determines how you view this matter. But what I assure you is, with the summoning you will feel they are here, and it will help you get rid of the disconnection and distance you feel. In ToZ it is mentioned that HPHC experienced seing an object move, so this is basically the Gods being on earth.. it is not just in our mind or dreams, they literally can do things that you will feel as ´physical’, like touching you.
Considering genetic engineering, my opinion is it is better not to be so focused on this, it will only make you feel more and more disconnected from the Gods, and there are many traps in that way. You may start feeling you are superior for some reasons, then after reading new stuff you will end up believing some other people are superior.
Your identity will then be tied to the physical, which will make you unstable and make you lose the spiritual sense and perspective through which you experience closeness to the Gods.
In my opinion, it is better to seek the Gods through embodiment, and through practice, consciousness, and refinement of the self, rather than through studying the genetics, etc. It is good, I love studying that too, but there are many traps in that way.
Same for history: it is good to read history and ancient religions. Just remember, as High Priest Hooded Cobra said, this path is about advancing, not going back and trying to get everything backwards. We should go forward.
This is my opinion and understanding. I believe it will be helpful, since I too was thinking the same way you are thinking now.
Note: I personally LOVE studying history and ancient religions and all what you mentioned, and I believe it IS beneficial. The idea is, if closeness is what you seek, if experiencing the Gods is what you seek, if knowing the Gods are real is what you seek, if understanding the Gods is what you seek, the perfect and fastest path is through ToZ practices. Even reading other people’s experiences is not that good; it is good but you will learn way faster by you having experiences.
Again , i am in LOVE with studying the exact things you are studying, i also do not think someone will elaborate the way you expect, on this kind of matters people agree on little, they may agree on the big scale, but if someone elaborate and goes into details, there will be several other opinions and theories, thats why i prefer to not to share mine.