Identifying with Calvin Becker in Portofino is easy for those who grew up fundamentalist, but are no longer in that particular camp. I recall a conversation with a cousin a couple of years ago which detailed the same kinds of experiences Calvin had. Since I grew up only half fundamentalist (mother was father wasn't) I was spared some of Calvin's angst, but was subjected to other types (my father was obviously among the "unsaved.")
I have appreciated Frank's work from the days when he was known as Franky. A lot of people associate his father with the sort of fundamentalist preacher that is portrayed in Portofino, but actually Francis Schaeffer encouraged his son to watch Fellini films and encouraged his forays into film making. Francis Schaeffer was outspoken against the list mentality in fundamentalism (see True Spirituality). It was Francis and Edith Schaeffer who encouraged many of my generation of fundamentalists to be more open to culture. I think that to assume that the Beckers are merely loosely fictionalized Schaeffer's is to not pay attention to things that Frank himself has written about his parents as well as things that Edith and Susan have revealed about the family. Francis Schaeffer once said that if we expect perfection or nothing we will get nothing. He would have hated a hagiography of his life. Towards the end of his life he was as distressed as his son at the direction that evangelical Christianity was moving in.
It certainly is amusing to see how Frank has taken his father's temper tantrums (documented by Edith) in which a flower pot routinely got thrown and encorporated it into the fictional character of Rev. Becker. I'm sure that there are pieces of his mother there as well (although I suspect that his maternal grandmother may be more to the point - since I never saw Edith in action I can't be certain of that). He even pokes fun at himself since he was a late reader.
Frank certainly got to see plenty of fundamentalist families like the Beckers as he was growing up. It certainly appears his mother grew up in one (his grandather wrote an empassioned tract on minced oaths - darn for damn was no better and also earned a mouth full of soap). His caricature of fundamentalism rings more true than a lot of people would suspect. However, Frank didn't grow up to reject Christianity. He found his way into a more historical form of Christian faith in the Greek Orthodox church.
Nearly every branch of Christianity (even I suspect the Orthodox) have pietists in their midst. Nearly every branch of Christianity has those believers who don't appreciate art, music, or literature that isn't explicitly proselytizing. Nearly every branch of Christianity also has believers who realize that art isn't necessarily about proselytizing. Much Ado About Nothing, Chaucer's Miller's Tale, Flannery O' Connor's Wise Blood, were all written by believing Christians, but they are all classed as great literature and are read with appreciation by people who don't share their author's faith.
You can read Portofino as a former fundamentalist and nod knowingly. You can read it as a non-believer and have it reinforce your ideas about fundamentalists. You can even read it as a fundamentalist and have it challenge your ideas about how to convey your faith to your kids and the world around you. The Beckers truly want to share their faith, they really do care about the lost. They simply have been handicapped by some of their subcultural baggage. Maybe what they really needed to do was go to L'Abri???
I think that people who have appreciated the Schaeffer's encouragement to reject the list mentality and appreciate good art will find Portofino an interesting read. I think those who simply found in Schaeffer an ally for their right wing politics (he actually wasn't as much of an ally as they think) and appreciated him for his strong stand for the Bible may find Portofino uncomfortable. But the people who find Portofino uncomfortable probably weren't happy that Francis Schaeffer was encouraging students from Christian colleges to view Satyricon back in the late 60's. Frank's work is not his father's, he isn't just a chip off the old block. But to see him as simply a son who has totally rejected his parents is to misread the situation, at least it seems so to me as I read Frank's work, Edith's work, and Susan's work.
In the final analysis Portofino is a wickedly funny book and a lovely look at an Italy that I would love to see (I suspect it is now covered with Golden Arches and Ben and Jerry's).
I'm looking forward to reading the last book in the trilogy and Frank's new military books.