I don’t think God is hiding anything. Science by its very nature can only discover things which are a part of the mathematical space-time structure of the universe. For science to discover God would mean that God can be manipulated by science and natural law, which is absurd. Demanding that science show God is very little different than demanding that you point to God with your finger, expecting that God be something you can see with your eyes. To say God is hiding himself is like saying an author of a book is hiding himself because you cannot find them in an examination of the letters of the words of the book. It is looking in the wrong place.
Otherwise this devolves back to the question of why God doesn’t show himself more obviously to people which is a question we have explored before: Why there is no proof of God, and this was my answer.