God's "Rules"

Today's sermon was on Ephesians 5:1-21, which talks about being imitators of God, and ridding yourselves of sexual immorality, greed, foolish talk, etc. These things are "fruits of darkness" or of sin and being separated from God. Anyhow, in the sermon pastor talked about how these are things we shouldn't do because they keep us from the light (Christ) and so on. The thing that got me was that he never mentioned that these "rules" are for Christians not for the lost. How can we expect people who don't know God to know God's rules?
This is something i struggle with. I judge people by their behavior and if it is Christian behavior or not, and i don't take into consideration if the person is Christian or not. I am learning to overcome this, but it is hard. I am surrounded by godly people who try and make godly choices and when i come into contact with someone who isn't a Christian and doesn't make "Christian" decisions i judge them. I decide if they are good or bad people and that is not right. I shouldn't expect a non-christian to live a life like a Christian. I should love them either way, because they have potential to be a Christian and i should see what they could become with Christ.

Lord, let me see people like you do, forgiven. Let me see the potential people have in you. Help me to judge less and love more. Amen.