“The first gulp from the glass of natural sciences will turn you into an atheist, but at the bottom of the glass God is waiting for you.” - Heisenberg

It doesn’t matter whether I’m atheist or not, but to state that you can fully explain - well - any process of the universe is simply naive. There are areas we know many things about, but biology itself has an enormous amount of accidental complexity, (which is often brought up by atheists as a criticism of design) for example many many signal path ways that do fundamentally the same thing, but differently. Compared to that, spaghetti codes have good architecture.

Whether God exists or not is imo orthogonal to the complexity of the world around us.