My concept of Christianity is rather expansive, and Christian anarchists are often inspired by Tolstoy, who is someone I have read about and whose works I have given some attention. I can confirm they are rather different than most Christians - Tolstoy in particular rejected the Church after he saw they were committed to enabling war, which is clearly un-Christian. Dorothy Day is another relevant Christian anarchist, and I have worked with a Catholic Workers House locally, so I have some IRL exposure to these folks as well.

I tend to think "Christian" is an almost meaningless term without more context or clarification, people who call themselves Christians hold opposite views on many different positions. "Buddhism" is no different, if anything it is worse, so this isn't particular to Christianity. Nor is it particular to religion, Marx spent some time in the Communism Manifesto clarifying what he meant by "socialism" and the different kinds of socialism he was aware of - there are many such overloaded terms and concepts. It seems particularly common in any political context, where there is power struggle it seems there are struggles between meanings for a particular word.