There is a lot of similar threads. I want to ask a slightly different question ( I think it is)
I am familiar with the idea that Deity is not necessary. I understand not having proof.
But,
Is there anything that suggests that God is an impossibility?
Is there anything in science that makes it clear that God can not exist and could not have had anything to do with the universe?
No, i.m.o. there's nothing which suggests that some sort of god-like alien intelligence
per se cannot exist and could not have had anything to do with the universe. However, there are many basic laws and observations in science which discredit the God of religion, who
interferes with the natural course of events, and who
plans the universe with human concerns in mind.
Here are some observations / laws of science which discredit this idea:
(1) Laws of physics, such as conservation of energy.
(2) Observations from astronomy: our world is one of many, and it is not the center of the universe.
(3) Observations of natural phenomena: lightning, earthquakes, volcanoes, etc. are natural events, not Divine interferences.
(4) Observations from geology and biology: our species is one of many, and came about by a circuitous route involving a lot of chance events, not by any clear plan.
For example, the proposal that God caused Jesus to be born of a virgin, as believed by Christians and Muslims, is one which would violate the most basic facts of biology, and even the most basic laws of chemistry and physics.
The proposal that God created the universe with human beings explicitly in mind, as part of a Divine plan, is discredited i.m.o. by the observations of astronomy, geology, and biology (though I would not say disproved). Earth is far from the center of the universe. The enormous size and complexity of the many other worlds in the universe, and the relative unimportance and impermanence of our world, suggests the universe was not specially-created for Earth with its inhabitants at the center.
And the forces of nature behave towards human beings pretty much as you would expect if they were not interested at all in our welfare. We now know, due to scientific advancement, that natural disasters are the inevitable consequences of tectonic plates and so forth, and have absolutely nothing to do with punishing sinners or sparing the righteous.
There have also been many studies on the efficacy of prayer to heal people, and yet zero evidence that prayer has any effect at all.
Finally, we know from geological and biological observations that life on Earth took a very tortured and circuitous route which eventually lead to the emergence of our species largely by chance. Many other species (like the dinosaurs) emerged and then were wiped out, over and over again, due to such chance events as a comet impact. The formation of the Earth itself, in this particular star system in this particular galaxy, with this particular (chaotic and changing) climate, was caused by many chance events during the chaotic formation of our solar system. No doubt, there are so many solar systems in our galaxy alone that worlds like Earth are bound to form, somewhere. The point is, the idea that an intelligent mind created the Earth specially, or planned it specially, is totally discredited, the Earth was not planned or crafted any more than the shape of a particular asteroid or the timing of a particular volcanic eruption.
So i.m.o. there are many facts and laws of science which discredit (but do not disprove) the existence of a
theistic God who cares about humans, interferes in the universe, planned the course of events, etc. However, I would say that if we are talking about a
deistic God, i.e. an alien intelligence who set the laws of the universe in motion but who does not interfere, and who did not necessarily plan things with humans in mind .... then there's nothing, scientifically, which says such an alien intelligence is an impossibility.