And if GOP drives out its Christians, they won't win the election for dog-catcher. And won't deserve to, either.
Try and remember the last time a party drove out its Christians. Its happened twice. One became a ghost and the other a cancer.
Whigs, and Democrats.
The Whigs didn't "drive out their Christians". They were torn apart internally on the issue of slavery. Christians during that era held a wide range of views on the morality of slavery, and were on both sides of that debate (just like there were Christians for and against prohibition). The Whig Party continued to run devout Christians until its dying day.
The DemonRats didn't "drive out their Christians" either. If that was the case, they would tell Jesse Jackson and Al Sharpton to stop self-identifying as "the Reverend" in public. What they drove out were people who follow orthodox, traditional Christian beliefs. They're fine with people who claim to be "Christian" on paper but don't follow traditional Christian morality.