Yes, your Bible does tell you to kill non-believers. Sorry I know your Bible better than you do.
A Christian is a Christian. The "they are not real Christians" defense is fallacious and still used constantly. The genocide in the Middle East and Africa was pushed, supported, encouraged, and justified by preachers, Christians in the news, and just about every Christian cult with maybe the exception of the Catholics (but even most of them were for it on individual levels). So, yes, that IS Christianity.
Does that mean every Christian is guilty? Of course not. Ron Paul is a Christian but fought against the genocide. As I'm sure you have as well. But, it holds true for an overwhelming majority, and any in "power" in the Christian cults. I've never voted for a Republican or a Democrat - and I've protested, supported Ron Paul, did what I could. So, no, I am not guilty of everything the sheeple are guilty of.
But, nor can you deny that the complicity of most Americans (and thus, Christians because we are the most religious nation on Earth and 85% Christian) is based on religious hatred and fear. The whole reason the sheeple accept the wars and the killing is because we are killing brown Muslims. They would never go for killing Israelis or Germans.....well, maybe Germans.
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain