That millions of Christians (and others) will die if Assad is removed from power sounds very anecdotal. Your opinion and your friends’ opinions need some evidence, some facts to support that claim.
If you care at all about Syria, and I’m not convinced that you do, then you know that the burden of proof should be the aggregated, first-hand, eyewitness testimony of the religious minorities living in Syria, not the lone voice of a single American woman who happens to have Syrian in-laws gathering stories from the other side of the world.
Who does that fall to? The same organizations making the anti-Assad claims which you have accepted. Tell Amnesty International to do the WHOLE job, not just part of it.
God save us from sanctimonious Westerners who are determined to tell all the Little Brown People of the world what’s best for them.