Holiness is as much about what you do on a Monday morning on the factory floor as it is about what you do on a Sunday morning in a church gathering. Holiness is as much about the kind of neighbour you are as it is about the kind of church member you are. It is as much about who you are when you are holding a steering wheel as who you are when you are holding a Bible.
But we can never change enough to impress God. And here's the reason: trying to impress God, others, or ourselves puts us at the center of our change project. It makes change all about my looking good. It is done for my glory. And that's pretty much the definition of sin. Sin is living for my glory instead of God's.