My point is this. If some calls themselves Christian, who are you as another Christian to tell them that they're not? You cannot pick and pull the good parts of religion and seperate them from the bad and only accept the good, stating that the bad is not really Christian. There are good points and bad of every religion and its histories. Accept that your religion is not perfect instead of trying to refine it, at the exclusion of certain peoples and events.
first point - I am not a christian
second point - there is a plethora or normative descriptions in the bible that one could draw upon to deem who is and isn't a christian- IOW scripture is the authority for any issue related to theism - if you want to dismiss them and say anyone who says "I am a christian" in any particular context is a christian you are working with an overly simplistic (or politically broad) use of the term