If Assad thought it would benefit his regime, he would slit the throats of every Christian in Syria. He is using them just like he is using every minority group in Syria to bolster his regime. He has no morals and will do whatever it takes to stay in power and survive.
I would only add to that.......Assad will retain power ONLY if Iran wants him in power, without Iran he cannot hold onto power alone.
Wait until you see what our al Nusra friends do to Syrian Christians.