The idea of God is a simple idea that explains everything and is impossible to disprove

It is simple: Even a child that can not yet speak can understand it.
It explains everything: Absolutely everything. For any question starting with "Why" you can answer "Because God wanted it this way".
It is impossible to disprove: No science can ever disprove the existence of God. God could exist outside of our understanding of space and time. We can never disprove the existence of o reality outside of our own.