Just because you cannot see the Creator of the universe does not mean he does not exist. Everything that we see on this planet was created and made by someone, planned by someone, inventions need blueprints and blueprints were created in order to create inventions, therefore the universe has a Creator and everything in the universe, easy peasy. The creator of the universe is invisible and not imaginary. The atheist cannot believe in God for the atheist is without God in this world according to Ephesians 2: 12 which literally has the Greek word "atheos" translated in English "without God" and the Word also tells us that the god of this world the devil Satan the evil one blinds the mind of unbelievers. Easy peasy for some of us who are Born of God to understand but for others it's a great mystery and even fairy tales. Everything we believe or don't believe has consequences especially in the long run. Make sure you believe right and not wrong before you die because eternity has no end nor ending.