Of all the openly religious people, Gelsinger did the least to mix business and religion. Whereas an irreligious person like Peter Thiel says some really wacky religious stuff.
Based on my brief interactions with him, and my overall experience with Intel as a project partner at the time, I'd say he has exceptionally high integrity. I'd bet he didn't even have his books ghost written.
https://pnc.st/s/business-books/9720205c/the-juggling-act-wi...
He gets into many of the issues discussed in this thread: having faith while being a CEO and how to handle that.