Saying that Jesus learned things is not blasphemy, unless you want to attribute blasphemy to the writer of Hebrews (5:7-9) and to many of the church fathers. Also, if Jesus fulfilled the law perfectly during his earthly life and ministry, one of the things he would have had to do is respect Israel’s teachers, and learn the law and the prophets from them and from his parents (Deut. 6:4-9). None of this means that Jesus wasn’t God while he was a child. The incarnation means Jesus was also fully human – his deity did not diminish his true humanity or vice versa. Also, the story you refer to seems to indicate he was discussing the Scriptures, which probably means that he was listening/learning as well as questioning and teaching. At any rate, one item of disagreement ought not make the entire book, or its author, or positive reviewers, blasphemous in your mind…what do you do if a fellow Christian says something or a Christian teacher says something you disagree with? Do you excommunicate them in your heart and walk away from that relationship? Are you sure that you understand Machowski completely? Are you sure there isn’t an aspect of his portrayal of Jesus at 12 in the temple that is allowable if not fully agreeable to you? Has Machowski’s portrayal really strayed into blasphemy and heresy here, or is it just a point of legitimate disagreement which can still allow for the rest of this book to be of value? I am absolutely certain that Machowski holds to the full divinity of Christ even while in his mother’s womb. And even if you are convinced that Machowski botched this episode, why not teach your children how to disagree charitably with a fellow reformed evangelical brother rather than consigning the book to the pyre?