I have no idea what Cindy means by this phrase. What, exactly, is a good Christian? A person who follows the Bible to a t, whose crimes are petty, like poking a badger with a spoon. Original, but hardly very terrible. Though I suppose that you aren't going to get very far by actually being good. The reality is that Cindy is as broken as the rest of us in her own way.
I think "good Christian" is a facade, a dated term my grandfather uses to mean a good Bible reading relatively unstained boy or girl looking for a spouse. Perhaps Cindy understands the term in a more humble way-flawed and sinful but trying and trusting in grace. I can wrap my head around that. To me, it seems that to be a good Christian means that you sort of are a bad Christian, falling short, not always doing what you want, rather doing the things you don't want. Kind of like Nick Lowe's song, Failed Chrisitan.
Personally, I'm hard pressed to even use the label "Christian". It has been so marketed, mass produced and surface that I don't at all connect with it. I believe in God, his existence, Jesus and his earthly task and I try to make the things that are important to him important to me. I usually never come close to the mark. Upon occasion I have some shining moments. I don't read the Bible nor do I feel bad about that. I rarely even go to church. By my grandfather's understanding, I'm not a good Christian girl. I'm pretty ok with that. Because I think, in the end, my grandfather, Cindy and I are all saying the same thing, it just looks different. And different need not be divisive which is a whole other post for a whole other time.