NAZIs and Commies don't much care about religion; many of them may have been born into traditionally Christian cultures, but their killings had nothing to do with being Christian and everything to do with their (separate) ideology. They didn't shout "In the name of the most-high Jesus" with every killing.
This is the same equivocation (trying to make Christianity as bad as Islam) as those including media who were so quick to point out that Tim McVeigh "was a Christian" - which curiously they never *bothered* mentioning BEFORE 9/11. (Because it was *irrelevent* to why he did it.)
I don't think Tim McVeigh believed in much of anything, let alone Christianity. No clergyman was present at his execution, as far as I know, and his last words, in the form of a written statement, included the humanist verse, "I'm the master of my fate, I'm the captain of my soul."
That's because the media are filled with humanists, secularists, Darwinists, atheists, socialists and homosexuals, so they don't know it means to be a Christian. What your parents baptized you into means nothing if you renounce your faith by walking away from it and never practicing it. But then again, the "major" media are scum-sucking liars and frauds anyway, and certainly are not trustworthy to print or report the truth.