I got taught this in church as a kid. Even heard it a few times as an adult. The problem? All I learned was that adults expected good deeds out of me to prove my love for God. Whether or not people who say that judge your Christianity by their own personal measuring stick, it's still the implication of that kind of statement.
I personally think that until you start not giving a crap what other Christians expect of you and start focusing on getting to a right place with God, you'll hate being a Christian. Being a Christian to please other Christians SUCKS. It's stressful and you're never good enough. Trust me.
Thank God that he, at least, doesn't expect perfection from us.
