Good idea; Christians are less prone to terrorism, have fewer children, and can be taught not to hate Jews and to accept the State of Israel as legitimate. So while not perfect from your perspective, it is a significant improvement to the current peace plans.
Correction: chrstians can be taught to accept the secular state founded in 1948; they will not and cannot by the very nature of things accept the rebirth of the Halakhic Biblical polity (may this happen soon, speedily, and in our days). Even the most pro-Israel American Fundamentalist Protestants could not accept that, which is why they want a Hebrew-speaking duplicate of 1950s America where Jews and chrstians live together and just go to different houses of worship on different days.
The reborn Biblical Israel, under Mashiach HaMelekh, will wage war on false "gxds" and religions and bring the message of the One G-d and His Laws to all mankind.