"Evil" is a Manichean construct which is subject to interpretation. I would say that most atheists I know are ethical people and would not tolerate what some would interpret as "evil".

As to what is a real Christian, this too, is a matter of opinion not based on any fact.
As long as your assessment of what is truly Christian, I have no problem with you believing that as long as I don't have to accept that. I think that it's OK to reject any system of religion. I don't think it's right to force that rejection on others and in fact that can't be done because arriving at a position of atheism is about thinking and reasoning and this can't be forced on any individual.