If I could hammer one thing into Rationalist’s heads it would be this: religions are not primarily concerned with explaining natural phenomena. It’s rarely even a secondary concern. Christianity isn’t, Islam isn’t, Buddhism isn’t, Hinduism isn’t, Judaism isn’t, and most of the rest that I’ve looked at aren’t either.
You may have a distorted view because Creation/Evolution debates have been elevated to The Most Important Thing in your particular bubbles, but even that revolves around a small handful of Bible chapters. You won’t find discussions of natural phenomenon in any of the Pauline epistles, or the Gospels for that matter. Psalms and Proverbs aren’t concerned with the interactions/existence of atoms. Religions want to answer, “what is wrong with the world, and what are we to do about it?” (Everyone agrees that all is not right in the world.)
Yes, overlap does occur, because no sphere of knowledge is fully distinct from all the others. That is why you get the evolution/creationism debate, and that is also why the physicists of the day needed Lemaitre to school them about the origin of the universe. Similarly, when Rationalists wonder whether we live in a simulation, they are simultaneously reinventing the Buddhist idea that this is all an illusion, and reasserting faith in a Creator God.