Nevertheless there is still irreducible complexity in nature where no answer has been found.
There are no known examples of irreducible complexity in biological systems.
Of course claims of irreducible complexity are falsifiable in the sense that if they are false claims, they can be refuted, but there is no algorithm for deciding if a system is irreducibly complex. Even if such a thing existed and was considered for possessing irreducible complexity, that can't be decided. It's always possible that the naturalistic pathway hasn't been identified yet, which might have been the case with the bacterial flagellum if it weren't known that it was a repurposed bacterial structure.
This a lot like circumstantial evidence in legal matters. If it is consistent with the police's suspicions, it doesn't rule the suspect in, but if it is otherwise, it can rule the suspect out. Before DNA testing, forensics might be able to tell you that the killer had type A blood, which rules nobody in, but millions out. Irreducible complexity in biological systems can be ruled out if it's not there, but never demonstrated if it is.
The elements of life assembling themselves without intelligent oversight does not rule out a designer and creator
No, but it makes one unnecessary. The history of science has been the demonstration that the universe can assemble itself (except life, which hasn't been demonstrated yet nor ruled out) and run itself day to day without an intelligent builder or ruler. What's left for this God to do now that we know that the sun doesn't require Apollo to drag it through the sky, nor Thor to make the thunder, nor angels to push electrons through wires?
Newton thought that a God was needed to keep Jupiter and Saturn's gravity from throwing planets like the earth into the sun or out of the solar system into interstellar space. His calculations suggested that planetary orbits should not be stable, so he invoked a God to explain what he couldn't explain otherwise. Then came Laplace about a century later with some new mathematics (perturbation theory) that solved the three-body gravitational problem and showed that the solar system was stable without the hand of God periodically making ad hoc corrections. Napoleon asked Laplace where God was in his conception of celestial mechanics, to which Laplace famously answered that he had no need of that hypothesis, and a god was relieved of yet another duty.
This progression is the origin of the phrase 'God of the gaps,' referring to the remaining gaps in knowledge at any given point in the evolution of scientific knowledge as the shrinking place for the god to find a job it is needed to do.
science seems to have shifted the goal posts in it's definition of life to call assembled elements "life".
As science progresses and evidence accumulates, the narrative is modified to reflect this new understanding. Modern thought about life is that it is a chemical process. My underground major was biochemistry, where we learned the chemical pathways that comprise metabolism and the regulation of that metabolism (homeostasis) to keep the chemistry happening (don't let the serum potassium levels get too high or low if you want the heart to continue beating, nor the body temperature, nor its pH, etc. - all chemistry). Abiogenesis is also called chemical evolution.
The only thing we do know at the moment is that life comes from pre-existing life.
I'll bet that you don't believe that. You believe that God created the life in the universe. Is a disembodied intelligence alive? I'd answer no, since it doesn't do the things living things do such as reproduce, grow, develop, repair, etc., and it isn't made of cells like all living things we know of are, but it's not important how we answer. If you consider God alive, then God would be an example of life that didn't come from other life, and if you agree with me that a disembodied mind like God should not be called alive, then that which you do consider alive came from a nonliving entity.
What people conclude about the existence of God from science is a matter of faith however and preconceptions and if the conclusion is said to come from science then I would say it is because of wrong thinking.
I can conclude that the God of the Christian Bible doesn't exist from both the evidence underlying the theory of evolution, and from pure logic (theodicy problem), but not that other kinds of gods can't or don't exist. The deist god cannot be ruled out, but it also doesn't need to be considered, since its existence or nonexistence would be equally useless information (apatheism). That's why I call my form of atheism agnostic atheism. I don't know if gods exist, and make no claim that none do.
But keep in mind that that is also the status of leprechauns and vampires, for which I also have no observation, argument, experiment or algorithm that can demonstrate that they don't exist somewhere.
Yet in the end, I agree that science does not rule gods out, and that people that say that there are no gods are unaware of what the limits of their knowledge are. I know that they can't know that even if they don't, and are taking a small leap of faith if they claim that they do.
What you are saying sounds like an argument from ignorance to me.