I can explain the existence of God to non-believers like this:
Saying there is no God is like looking at a great work of art. Let’s take Leonardo DaVinci, for example.
You could look at one of his great works such as The Mona Lisa or The Last Supper, and say that the paint is made up of this or that chemical compound, and the paint particles just exploded and just happened to land on the canvas that way. But that gives no credit at all to the artistic genius who created the masterpiece. How would Leonardo feel if you said that about his painting?
So if you would give credit to an artist who painted a great work of art, how much more credit and admiration should you give to the One who created all of the intricate beauty of Heaven and Earth and the entire universe? How much more wonder and awe would you have for the One who invented everyone and everything in the universe, from the infinite expanse of space, down to the tiniest, microscopic atoms and organisms, insects, seeds of plants, and the anatomy of the human body?
As mind boggling as it is to believe that everything was artistically designed from nothing by a Creator that we can’t see, it’s even harder to believe that it all just happened to come together by accident, as a result of an explosion in space, and over time everything just magically evolved into perfect place.
Take a big canvas and throw a bunch of paint at it in different colors. Just toss it on there in big, sweeping, even violent, explosive motions. Put the canvas next to Leonardo’s Last Supper painting. How does it look? Wait awhile for it to evolve. Any changes other than the big blotches of paint drying? How does it compare to Leonardo’s masterpiece after you waited awhile? The more time that goes by, does your painting morph into a masterful work of art with amazing brush strokes and organized detail?
If you blow something up and look at what’s left afterwards, it’s utter chaos, disorder and destruction. But if you look at the result of the work of an artist, there’s order. It’s a meticulous, beautiful, awe-inspiring labor of Love.
Take another look at a sunset, the inside of a spiral seashell, one tiny seed in your piece of fruit that if planted, will grow into a plant or tree that will produce even more food, and tell me how an explosion created that.
Explosions, big bangs, are destructive and chaotic. Creation is quiet and ordered, resulting in meticulous design.
If Leonardo would be insulted if you didn’t give him credit for his masterpiece, imagine how your God feels who created you and absolutely everything in the expanse of space.