If you had been placing bets 150 years ago around what physics would have to say about the existence of God, you would have lost a lot of money.

Modern Physics and Ancient Faith

By: Stephen M. Barr Published: 2003 312 Pages

Briefly, what is this book about?

Barr takes all the discoveries of 20th-century physics, stuff like the Big Bang, quantum mechanics, the various forces, and argues that all of these things are more compatible with belief in God, specifically a traditional Judeo-Christian God, than with a belief in pure materialism.

This is illustrated most succinctly in the underlying values for various background constants of the universe. For most of these if they varied even slightly then life would be impossible. This is known as the fine-tuning argument for the existence of God, and Barr lays it out in rigorous detail.

What's the author's angle?

Barr is a scientist, and a believing Catholic. So he definitely has a dog in the fight, but he also does a good job of steelmanning the other side of the argument. Also it's important to clarify what the fight is. It's not a fight between religion and science. Barr is both a believer and a scientist. It's a fight between religion and materialism. Which is a different animal. This is not to say he's dogmatic (perhaps I shouldn't keep using the word "fight") the tone is very reasonable. He's mostly targeting a lazy "modern science shows that God is silly and unnecessary" crowd.

Who should read this book?

This was one of the books mentioned by Ross Douthat in his book Believe (see my review of Douthat's book here, or check out the PSmith's far superior one here). And I was glad I followed Douthat's recommendation, the book did not disappoint. If you're at all interested in the fine-tuning argument or related ideas I think you'll love this book. But I can clearly see where it's too niche for the majority of people.

What does the book have to say about the future?