When tech luminaries talk about their Christian faith, people listen.Everything clicked when Peter Thiel gave the speech about God.The occasion was a 40th birthday party for Trae Stephens, who is Mr. Thiel’s venture capital partner as well as one of the founders of Anduril Industries, a maker of high-tech defense systems and weaponry. It was a multiday affair, held in 2023 at Mr. Stephens’s home in New Mexico. It began with an evening roasting the birthday boy, followed by another toasting him and then a brunch with caviar bumps, mimosas and breakfast pizza. At the brunch (the theme was the...