I'd forgotten how thoroughly unlikeable the protagonist of this book is. Ick. I also had a hard time understanding what caused him to fall in love with Marga, and even more, WTF did Marga see in him?It's an interesting meditation on religious fundamentalism, but ultimately it strikes me as a little too facile. It was written near the end of Heinlein's career and it feels a little as if it were done by rote. There are several recycled bits from earlier works, including the obligatory reference to consensual parent/child sex. The dialogue is a bit stiff- RAH was very stingy with his contractions, and I think that makes for awkward sounding conversations.The Farnsworth family were far and away my favorite characters. I liked the steampunky elements of the first several chapters. In the end, though, I couldn't get past my distaste for Alex. This one's not going back on the shelf. 2.5 stars.