“Why is there something rather than nothing? The sufficient reason…is found in a substance which…is a necessary being bearing the reason for its existence within itself.” - Gottfried Liebniz
God is a necessary being. That is, God’s nonexistence is impossible. To a believer, it is impossible that God cannot exist. So, why is there something rather than nothing.? There is something rather than nothing because it is impossible for there to be nothing. God exists necessarily.