It was written by the author of Awkward Moments in the Children's Bible.
Which, by the way, is NOT a children's book.
I love it, simply because it makes sense.
I imagine most Christians would find the very notion of this question to be "insane" in and of itself. Therein lies the challenge - strangers. separated by centuries, assuming that they would know better than a man's own family members...
This isn't the only time the Bible refers to Jesus as being anything but the perfect Son of God. In fact, the very next passage begins with the townspeople accusing Jesus of being possessed by Beelzebul, the ruler of demons. And, why wouldn't the believe this?
Try to put these stories in a modern perspective. If you found yourself on a subway train when a stranger came aboard (with a gang of followers) and started preaching to passengers that he was not just the Son of God, but God himself, and that the only way to get to heaven was through him, and that you needed to abandon your family to follow him, and that you needed to drink his blood and eat his flesh for external life.... Well, would you move closer to this man and his ragtag gang of followers? Of course not!
Now, imagine this was YOUR OWN son or brother. Your heart would be breaking... You would be terrified. You would be trying to get him any help you could. You would be trying to protect him. Yes, this is horribly sad, and many might invoke the visual emotions of poor Mary, as she watched Jesus carry his cross to own death. However, this gut-wrenching sadness does not a deity make. Many mothers have watched their mentally ill children suffer and die horrific deaths, often unaware of what was even happening to them as the needle was placed in their arm or the noose around their neck. Tragic. Horrific. Human.
"Then His mother and His brothers arrived, and standing outside they sent word to Him and called Him. A crowd was sitting around Him, and they *said to Him, "Behold, Your mother and Your brothers are outside looking for You." Answering them, He said, "Who are My mother and My brothers?" Looking about at those who were sitting around Him, He said, "Behold You are My mother and My brothers! For whoever does the will of God, he is My brother and sister and mother." Mark 3:31-35 (CEV)
IMPORTANT QUESTION: Are these not the actions and language of a "crazy" cult leader who abandons everything to live out their own obsession, living in their own delusion? And, can we really take the disciples word for what *really* happened in the New Testament, when, by following this leader, they may have been just as "insane". When members are rescued from cults like Heaven's Gate or even the Branch Davidian - do we take the claims of these followers seriously? No.
(Note: Other translations say this his family thought Jesus was "crazy" or had "gone mad" or was "out of his mind". Either way, if it quacks like a duck...)