Genesis 13

When brothers began to fight and bicker among themselves, then it was time for separation. God had plans for Abraham, and had to separate him from lot to bring it to pass. The worldly Christians that embellish our churches today, will pull you down, stay away from them! Teach them when you can, (and if you can). Many will not listen to sound instruction, that's why they are weak!, but don't seek to fellowship with them too much. None is to be ignored, but we must not cling to them as intimate friends, not until they grow in the Lord a little more. 

This is especially true when one is known to indulge in open sin, flagrantly, we need to separate ourselves from him for the good of ourselves; our testimony, and for the Word of God. Turn them over to Satan for the destruction of the flesh that the soul might be saved, as in 1 Corinthians. 5:5, and be careful not to be partakers of their sin, or to take pleasure in them and their sin. (Rom 1:32) Lot "pitched his tent" toward Sodom, and later was found living there. Let this be a lesson for all of us. What we put before us will lure us further into its clutches.