Thought it was after Methuselah that God decided "okay im cool lets kill off these stupid humans"
Take a look at what the Bible - the best source we have for this - says. God did it because wickedness increased throughout the world beyond a certain point.
Science is showing us that there is structure in nature. Science is showing us that nature adapts to certain structural changes. Science also shows us that nature collapses in areas where the structural changes are too great. The science of psychology shows us that people go mad if their psychological structure gets too far out of whack from what it should be naturally. So, why is science so unwilling to look at the spiritual, structures in the universe? It's in spiritual structures that we see hints of God.
Not sure what you mean, exactly. But consider this fanciful thought.
Imagine for a moment that God exists, and that He is very powerful, way beyond understanding. Imagine, also, that for His own purposes He sees you and is even aware of your thinking.
So, one day you happen to be a bit more favorable of Him in your thoughts. For whatever reason (or non-reason) you simply think good thoughts about God one day. God wasn't expecting this from you (because He designed people to be great enough that He doesn't quite know what people will think from day to day). So, God goes all the way back to the beginning of creation, and tweaks it and time so that things match your feelings for the day. And He does this kind of thing on a regular basis, not only for you, but for all people. People never know that God does this, because they exist inside the changes as though it had never been any other way.
The point? We don't know how collapses caused by entropy are upholding the general structure. For example. Modern medicine has shown that as a person gets older, and as his immune system wears out, certain parts of the immune system kick in to cover areas that other parts have failed in. The immune system is extremely complex. Yet, over time it fails, and the person dies.
A similar thing is happening with the universe. Because of the complexity of the universe, we simply don't see it easily. But we see it when we examine the fossil record and see that there are only about a third of the plants and animals still around than there used to be. Life is dying off, becoming extinct. Entropy, but a very slow one.
The whole thing acts according to structure. Yet the structure is dissolving.