Don't forget, in the *story* (read: outright lies) of Jesus' conception, God got just the tip in and managed to impregnate Mary, without her knowledge OR Joseph's, and without popping her cherry. IF that pack of outrageous bullshit happened, then half of the genetic material came from God, the California Surfer Dude. The other half was Palestinian Jew, so obviously God's genes pack a powerful punch.
The other take on it is that the first Christian bible wasn't written until 425 A.D. (attention-deficit), so it was all pure guesswork what he'd looked like 400 years earlier. In short: they fibbed.... LOTS.