How do they handle people who are living together unmarried coming to church? I say let them keep coming as long as they don't cause conflict and keep hitting them with truth....that it's not okay.
It depends, do they claim to be Christian?
If they do, Paul had a pretty good strong arm approach
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1Co 5:1 It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife. 1Co 5:2 And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you.
1Co 5:3 For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
1Co 5:4 In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
1Co 5:5 To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
Actually they should be confronted privately before it gets out of hand.