Sure. But the use of "apologist" in a Christian context is, today in 2015, much more niche than, say, calling the news organ of a particular political stripe "liberal apologia"; it would be rare to see the New York Times use that phrase except in irony but much more common for conservative sources to do so, because it's commonly understood to be more negative than neutral.

It's much the same as getting mad when somebody uses "hacker" to mean something other than "train and/or computer nerd". You don't get to lay a prescriptive claim to truth.