That is the question Jeremy asks on his blog Till He Comes.
In the post he talks about the bones that have been discovered that are supposedly the bones of Jesus. He pokes holes in the theory but then asks this very challenging question.
Here is my response:
It wouldn't change much in what I believe and do because as it is I believe something that I did not see, I cannot prove, and still have doubts about from time to time. Even so I have experienced the power of the resurrected Christ in my life and if he is not raised from the dead then what is that? My over active imagination? If so, then I'm content with that in the same way I am content with my occasional doubts.
If they could somehow prove that those were the bones of The man who claimed to be the son of God it wouldn't change much for me because it would still take a certain amount of faith in the legitimacy of the "proof" to nullify our hopes for eternal life in Christ.
Here is the link to his post, sorry it isn't neat and clean but I'm on my mobi.
What if it was a hoax? How would it change what you believe and do?