Here's a thought.
We know that many Christians want to rebuild the Temple of Jerusalem because they believe this will bring about the "End Times" prophesy. Why not let them? It may stir things up a bit, and a few fundies might move on to the afterlife, but what the heck?
I say, if this is what they want, let them do it. Publicize this all over the globe! Let the world know, "We're rebuilding the Temple to fulfill the End Time prophesy in Revelations."
Then, when nothing happens, the whole world will know how stupid religion is (at least the Jewish and Christian religions), and we can all move on with our lives.
Sound like a plan?