Most of The Da Vinci Code is likely simple fictional embellishment. But regardless, the "humanizing" and "sexualizing" of Christ -- which as far as the silver screen goes, was already done nearly 20 years ago with Martin Scorceses's excellent picture "The Last Temptation of Christ" -- is toxic to fundamentalist Christian belief because this belief relies crucially on Christ's differentiation from humanity. Without this differentiation, humanity cannot aspire to anything real, since humanity is so mired in illusion and limitation.
There is some truth to that, as we humans have demonstrated over and over for thousands of years our general inability to treat each other humanely. But the problem as I see it lies in this need to condemn human nature at its core. That is, the body, sexuality, procreation, are assumed to be flawed, stained, and thus impossible for a manifestation of God (Jesus) to truly embrace.
But is regarding our essential humanity as flawed, tainted, truly the way out? Has it "worked" up to now? Or is it possible that there is a profound healing in the very idea that Jesus was human in all ways? Would it not then be possible to truly forgive our human limitations, and to stop feeling that insidious guilt so often connected to human impulses?
After all, if Jesus was fully human, in all ways, and still attained to the highest spiritual state, then would that not open up the possibility for all to realize their highest spiritual potential, regardless of how many times they'd yielded to temptation? Regardless of how deeply they'd stumbled?
I'm reminded of Rumi --
"come, come, yet again come,
wanderer, idolator, worshipper of fire,
even if you have broken your vows a thousand times,
ours is not a caravan of despair.
Come, come, yet again come."