because the existence of God cannot be proven or disproven.
Really? Look around you. Who created it? Humans are still finding things out about the universe to their amazement. They will never know it all or understand it all as much as they try. They try to make themselves SUPREME with 'their' knowledge. It WILL NEVER HAPPEN. There is only ONE SUPREME BEING and that is Our God, Our Creator.
They cannot accept what they won't confront and they won't confront that they don't know (nothing). So they make things to fit their 'own' knowledge and understanding. To some it is quite laughable - it's almost like 'Intelligence Envy. They HAVE to be more intelligent than The ALMIGHTY. It's a dead end road, it will never happen. But don't tell them, let them spin their wheels. Who knows, they may come up with a better shape for a wheel. ;)
Do you have any evidence? The existence of the world doesn't prove God's presence.