I’ll be the first to admit that at times in my life I have been wrong about being a Christian.
I mistook being conformed outwardly for being transformed inwardly. I sometimes had an unconscious tendency to adapt to my environment. I spent time with Christian friends and before long I looked, acted, and sounded just like them. These changes were good but they were usually temporary and should not be mistaken for true holiness. They were merely superficial responses to spiritual peer pressure.
But sanctification (God’s work to make me holy) is not temporary adaptation to my environment. It is not me looking more like other Christians, it is me looking more like Jesus. I’m being remade after the image of the One who created me (Colossians 3:10). The ongoing redemptive process doesn’t make me look more “churchy” it makes me look like Christ.
Anything less just isn’t Christian.