Galatians 6:10 (NIV)
Therefore, as we have opportunity, let us do good to all people, especially to those who belong to the family of believers.
*In order to understand and properly love on those who aren't saved, you must understand the heart of those who are born again... Those who actually made the choice to come to God despite their flaws. Work on understanding how to uplift and assist those within the body of Christ in order to grow together. If people see unity, love, and how we should be assisting each other in prosperity within the body, then it will cause those out of fellowship to desire God. We are often harder on those within the body of Christ, despite the fact they are still growing, but passive with those who outright deny and disrespect God. Love and truth should be displayed to both parties as a way of persuasion and edification for all people. We are all created in God's image and if you learn to see people in that light, you will know how to treat them right.