He's saying you don't need to prove yourself to us. We don't give 2 shits about Christianity. The true/false belief of your god is in your heart, and you should not have to worship in front of other people. You can follow the goals of your religion as well or as poorly as you see fit, and then if you actually think the deed you did is in fact a "sin, then it is within you to either feel guilt or lack thereof. To be a real Christian is not to flaunt, argue,put on a front, to actually feel guilty of sin, and not to just mull it over, do it any way and then just pray about it because some god will forgive you.

In short I think he meant shut up.