Romans 2:23-24

You who boast in the Law, do you (repeatedly) dishonor God by breaking the Law? For “The Name of God is Blasphemed Amon the Gentiles because of You,” just as it is written (in Scripture). (Is 52:5)

Sin has corrupted people inside and outside the church. Our job is not to be a Christian in name only but to show the true Jesus in word and deed. Yes, we may mess up but repent and don’t stop trying. People need to see true Christians who keep God’s law and who they can trust. That is the Christian who will reach the lost.