This is a re-read from 25 years ago. It should probably go down as one of the great “new apologetics.”
Greg Boyd was a seminary professor, and his father was agnostic. The book is a series of letters they exchanged about faith over three years. The father raised virtually every single complaint and question about the Christian faith that anyone could conceivably raise. The son does his best to answer then, though he admits occasionally that he’s at a loss.
The book is a wonderful format, and both an easy or difficult read, depending on how deep you want to get into it.