Jesus Himself addressed the issue of "Christians," performing evil deeds in a rather chilling prophecy:"Many will say to Me on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' And then I will declare to them, 'I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.'" One should note that Jesus said that "many" people who think they are His followers will be rejected by Jesus when at the judgment when they attempt to claim that they are His disciples. Not all who claim the name of Jesus are actually His disciples. My guess is that in even the best of Christian churches only about half of the people have been truly born again (see John chapter 3) Christianity should be judged on the basis of what Jesus said and did, not on the basis of the actions of people who merely claim to be Christians.
Like I said before, "Christians" have committed atrocities against other religious and non-religious people. However, atheists have committed far more atrocities than all religious groups combined. Even so, the key factor in these atrocities has been totalitarian power, rather than religion, which has resulted in these hundreds of millions of murders. The Bible says that people are evil (and the statistics on this page support this claim), but that they can become transformed through the power of the Holy Spirit to live lives of love and peace.
I mostly agree with your comments. In fact, I would totally agree if you included one little thing: There are VERY GOOD people who, by following their conscience, rather than "RELIGIOUS" dogmas, very successfully meet the criteria of what should be a "real Christian," and many "show off Christians" who are so far from Jesus Christ's teaching that they would NEVER be recognized by Jesus as following his intent, but instead are turning away good people who are sickened by such hypocrisy.