The term itself implies that there are "bad" Christians, which sets up a whole system for focusing on behavior rather than the heart. In fact, I Googled the term "good Christian" and came across this interesting article in WikiHow that lays out no less than 16 steps to become a "good Christian". And then as if 16 steps wouldn't do the trick, they added 6 more "tips". And if that were not enough, there are an additional 12 "warnings" to help steer you in the right direction. Good luck with all that. I found the one "reform yourself" especially interesting. As if anybody could.
Like I said, the whole "good Christian" approach is all about behavior. Now I'm not advocating bad behavior ... I just think its a good idea to remember that we're all sinners saved by grace and our need for grace doesn't end when we accept Christ. To me, it's pretty simply, not easy, but simple: Love God, Love People. Nothing else matters.
Maybe Rich says it better....
I would rather live on the verge of falling and let my security be in
the all-sufficiency of the Grace of God than to live in some kind
of pietistic illusion of moral excellence ~ not that I don't want to be
morally excellent but my faith isn't in that idea that I'm more moral than
anybody else. My faith is in the idea that God and His love are greater than
whatever sins any of us commit. ~ Rich Mullins
* Photo by Nikki Sixx who may or may not be a good Christian but is an amazing photographer who I believe "gets it".