"A universe with a god would look very different to a universe without one.” Richard Dawkins.
It's one of the wisest things Dawkins has ever said. Believers and unbelievers alike should take heed.
Let's tease out some implications of it.
1) Dawkins clearly has a doctrine of "god" in mind as he makes the statement. The flying spaghetti monster wouldn't affect the kind of universe we inhabit. But Thor might. Allah in a different way. And the triune God, different again. Therefore it's not a straight binary choice.
2) I would look different depending on the existence of God or not. Dawkins seems to imagine two states (a theistic and an atheistic universe) as alternatives lying before him. And who is the great unmoved mover in this scenario? Who is the neutral observer, the one enthroned above all worlds? The scientist! But no, Dawkins' thought experiment - if it takes the word "God" with any seriousness - is one in which everything must be re-imagined. If I am a creature, made by the Father's Word, intended for life in communion with God, then everything changes for me.
3) I would look differently depending on the existence of God or not. If I was a creature of the Word, and if the world is a creature of the same Word, I would look through the lens of His Word. I would see all things in relationship to Christ the Creator. That would simply be good science if the Christian God existed.
But here's something strange...
4) Dawkins ridicules Christian scientists who do actually deliver a different vision of the universe to his own. Yet how could they do otherwise, if "a universe with a god will look very different"?
Which only makes me think...
5) Dawkins has not entered into his own thought-experiment for even a minute. Has he really considered the revolution involved in actually reconceiving Self and World and God according to the Christian vision? Of course not. To do so would mean repenting of his position as all-seeing Arbiter. Or in other words:
"Unless you change and become like little children you will never enter the kingdom of heaven." (Matthew 18:3)