Donald Miller’s books Through Painted Deserts and Blue Like Jazz are meaty, fun, insightful, gentle, companionable, honest, endearing.
He articulates things about being a Christain that I’ve wondered about, or was afraid to wonder about.
He can express ideas without resorting to Christian-ese (i.e.”canned” phrases that mean little to regular people not already steeped in doctrine).
Even people not interested in Christianity would find the books enjoyable. For example, Through Painted Deserts could just as easily be categorized as a travel book.