C. S. Lewis, in his book Mere Christianity, spoke of Christianity as a "Great Hall" with doors that lead to different denominations lining either side. He also said that we were "under orders" to pray for them. It can be a waste of time to try and evangelize a foreign mission field when the church structure at home is decaying and coming apart at the seams.
I'm speaking to Christians: Please. Let's unite and let God knit our hearts together. The inward sins of pride and hardness of heart, apathy and ingratitude—the ones that God sees—eclipse the outward sins that everyone else can see. And Jesus' shed blood forgives them all. We have no business shunning people who are struggling with an emotional dependence to a sinful substance (drugs, alcohol, pornography) when we ourselves are touting an emotional independence that is supposed to pass as (a cheap substitute of) maturity and wisdom. Oswald Chambers says that "discernment is never given for criticism but for intercession." Focus on your brother and sister in Jesus and pray for them. Lift them up to God and forget about your needs. God will see to it that you're taken care of.
And the world will sit up and take notice that we have been with Jesus.