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I thought the book started out pretty slowly but once it got going it was a decent chase. I think this will be one of those rare cases when the movie turns out to be better than the book. There's a ton of controversy surrounding this book and for the most part I wish people would remember that it's a novel. It's not listed as non-fiction for a reason.
For me the most intriguing question is not so much "What if Jesus had a child?" but rather "What difference would it make if He did?" Now hear me out here, I'm not saying "What if Jesus had a child and the Bible forgot to mention it?" But would being a father have made His sacrifice in any way less valid? If I believe that the Scriptures are true when they say that Jesus was both fully God and fully man, would He have been any less of a Saviour if he had had a child?
Jesus came and walked among us and it says that He experienced all the emotions that are common to man. Would that have changed if He had experience parenthood? I've heard it argued that if Jesus had a child He would be less divine (sorry I can't remember where I read that, I'll look for it) and I can't see the logic in that. Afterall, God Himself is a Father. (As a friend of mine likes to point out, God is a single parent family :)
I believe that the biblical account of Jesus is accurate, and that He did not father any children here on earth but even saying that, I don't think that He would be any less the Son of God if He had had a child of His own. I don't know if it would mess with the Trinity but I don't think so. God exists in three persons, one of whom, the Son took on humanity for a time. If in His humanity He had a child that child would certainly be someone special but would it necessarily require a change in theology?