That's pretty much the definition of "God of the Gaps", isn't it? Every time we find a way to explain something without invoking the supernatural, people retreat into what's left, as they see it, as unexplained.
What I find fascinating is the way god/s retreated from being part of this natural world to living in some alternate dimension. It's the ultimate retreat, because we can't come up with a natural explanation by definition. God isn't natural! The problem is that by doing that they stretch the requirement of faith to breaking point. Back when people believed in gods of nature, it was relatively easy. If rain is caused by a god, then see! The plants grow! Thank you, rain god! But the new god doesn't seem to do much in the world. Gotta explain that. Well, he doesn't want to do anything. That doesn't seem right, there's so much wrong we could do with some help! It's not up to you to question God. And anyway, he gives us this nice heaven when we die. That does sound nice, how can I be sure about it? You have to just believe by faith.
God gets further and further away in terms of our ability to verify it. And I don't think that's an accident.
No offense meant to those with different ideas of how god is experienced, like the appreciation of beauty in the world. That's not what "God of the Gaps" addresses.