Goodis relative considering religion itself is a creation of man.
That's not what I meant.
You mentioned "Christians" not following Christianity being a bad thing, "relative" to you, and you mentioned things you consider bad that these "Christians" shouldn't be doing or saying because it goes against what they claim to follow. So what they claim to follow and what they should follow is good, relative to you.
Now if Christianity had teachings such as "racist nonsense or advocate killing 1/5 of the world's population" and if Christians today did not follow those teachings, then it would be good, relative to you, that Christians don't follow Christianity.
Whether or not it's good that someone follows or fails to follow a teaching or ideal depends on whether or not that teaching or ideal is good, relative to you.