Rather than have Christians (and Jews) leave, I would encourage a 'Reconquest' of France, along the lines of the Spanish 'Reconquista' from the Moors that had invaded it in A.D. 711! We would all join in 'Onward Christian Soldiers' and the like, and fight them back all the way to their caliphate in Bagdad! I'm sure this time Sharon and his fellow-Israelis would gladly join us!