On the surface, not that much. If there is an active bloodline of Jesus Christ alive and present to this day, its benefactors have failed to demonstrate anything in the way of his 'Christ Consciousness' with any noteworthy impact on humanity that I am able to observe. However, it does bring many things into question and causes a healthy debate over several issues that wouldn't have surfaced otherwise. It is high time that people, as a course of their spiritual development, began to question traditionally accepted ideas, started to think for themselves, and came to their own conclusions about such matters.

Why such controversy? The commonly accepted view that Jesus was/is God incarnate, being absolutely divine and above reproach, may have been accepted without forethought by followers some 2,000 years ago, doesn't particularly jibe with many of us anymore, somehow feels out of place among modern thought? Now we have a story that Jesus may have fathered a child; actually had Sex and a carnal relationship with a mere mortal of a human being! How outrageous? The concept of the Virgin Birth further emphasizes this mindset that a deity could never have been conceived through this natural human act. I can see a deliberate attempt to mislead in the depiction of the Garden of Eden, where the realized significance of procreation is portrayed as a consequence of 'The Fall of Man'. Not being a follower of Christianity, or any other religion, I have the view that Jesus Christ must have been an incarnate human, just like you or me. That we each have the capability to attain his levels of awareness with the potential to perform those miracles he is said to have performed, and even more? The biblical references to being Born Again and the entry into The Kingdom of Heaven, have many meanings. The Da Vinci Code may be a catalyst where people are coming to terms that such ideas, that now feel more comfortable, rather than simply to accept the authority about anything a religion puts forward, without question?

What is truth, The Truth? You can always find scholars and confidants all giving their treatises of research and elaborate proofs in order to convince yourself. In the end it can boil down to your biases and what you've prepared to accepted as your pet ideas over a lifetime, and are probably unprepared to re-evaluate, closing the mind to anything that may dislodge habitual thought. Unravelling the Truth can become quite a formidable task; much more difficult than what you may have expected. I can look back to times in my life when I have felt completely lost, muddled, totally confused, confronted with a dilemma, and yet was able to find my way. In these situations the pertinent question I found asking myself is: "Have I observed, felt, or experienced what I am being told for myself, in person?" If the answer is 'No' I am prepared to take a stand, and refuse to Believe It! It can take a great deal of courage to stand up in a crowd of people, unsure of yourself; and no matter how convincing they appear to become - talking themselves blue in the face, you remain in your conviction that you are right and everyone else is wrong. You later come to realize, some time after, that miraculously you had really made the correct decision at that time. I can fully empathize with the victims of such events as the Jonestown massacre, Guyana, where in 1978 913 people committed suicide as the followers of the People's Temple. How perplexing that decision to drink the cool-aide mixed with cyanide and join their leader, Reverend Jim Jones, in heaven, would have been. The Truth, like most other things, is in the eye of the beholder. For the most part it is unknown; and yet it is sprinkled anywhere and everywhere, and can readily change. It has to be sought, discovered and earned on an individual basis, and can therefore be uncommon to someone else. The Truth is something I believe I will recognize when I experience it.

PS: The book of Mormon (The Church of Jesus Christ of the Latter Day Saints) depicts Jesus as continuing his ministry, throughout the Americas, after his crucifixion. Before his final departure he mentions the continuation of his mission in other, alien, worlds.
http://www.physics.byu.edu/faculty/jones/rel491/handstext and figures.htm

Did you know you can visit Jesus Christ's grave? Where! In the village of Shingo, Honshu, Japan. According to the teachings of Sukyo Mahikari (a Christian religion founded in Japan) Jesus never died on the cross, but was switched with his brother before the event. He later returned to Japan where he lived out his life to the ripe old age of 106. Japan is also perceived as the true holy land and the Japanese are the lost tribe of Israel.
http://members.ozemail.com.au/~skyaxe/tomb.htm