That cannot be true, since the mechanisms for those things are fairly well known. There is just no place for him in those processes.He is said to do things like making the Sun shine and the food in your intestines to digest.
Let's look at the issue of making the Sun shine, for starters.
First, there need to be time and space in which it will all take place.
(Time and space are notorious for being impossible to produce by humans.)
Then we need hydrogen and helium and some other elements. In considerable quantities.
(Also known for being impossible to make from scratch for humans.)
Then they need to be brought to the point of nuclear reactions that produce such light that is visible to the average human eye that is at the distance that light passes in about ten minutes.
All this then has to persist for millenia.
(...)
IOW, if humans cannot reproduce something entirely on their own, then they cannot say they know how it works and how it came about.
So there is plenty of room for God in making the Sun shine.