There’s no such thing as a “good” Christian
Lots of folks who want to improve their lives (e.g. to be accepted by God, to get closer to God, to be loved more by God, to gain God’s favor and blessing) try real hard to be a good Christian. The operative word here is “try“.
But “good” Christians don’t exist.
The moment we “try” to improve our lot as a “Christian” we take the focus off God and place it squarely on our self effort.
In God’s Kingdom what we do on our own doesn’t count for anything. The only thing that counts in God’s Kingdom is surrender to Christ’s life in us. Christ wants to live His life (not ours) in us, through us, and as us to bring Glory to God. Period.
I am the vine; you are the branches. If you remains in me and I in you, you will bear much fruit; apart from me you can do nothing. John 15:5