This is the hardest part of being a follower of Christ. This is that moment of truth wherein you must protect the church by being harsh with it. It seems counterintuitive to call for separation if the inheritance of following Christ is unity, but unity is never at the sake of holiness. You may find that you are gelled with that unholy person but disconnected from the holy God. It is a sad and heavy thing to be sure. There comes a point when we all must choose holiness and fealty over the blessings that God has given us. Adam chose the blessing of his wife over holiness and ended up destroying the world. Abraham chose holiness over his son and ended up with even more blessing that the majority of us now commune with God through. We must weigh relationships very carefully. It is our responsibility to do so. And to do so with a conviction that has a lasting effect.