If NO ONE in the NC will "tell his brother or neighbor to know the Lord," then how do you deal with this:

Some say that there is no need to evangelize New Covenant members because they all know the Lord. They are individually saved (Malone, 94). This is subject to a serious reductio ad absurdum by this unfortunately ever-so-real case: Say a man comes to your church. He hears the preaching of the word. Tell the pastor and elders that he believes in Jesus. They tell him to repent and be baptized. So he does. His repentance is genuine. This means he has been regenerated. He is thus a New Covenant member. For 2 or 3 years this man plays a vital role in the congregation, serving, tithing, and even helping other new converts in their growth. This man is growing is sanctification and knowledge. But, as often happens, Satan attacks this man. God has chosen to discipline his son. As the London Baptist Confession says,

And though they may, through the temptation of Satan and of the world, the prevalency of corruption remaining in them, and the neglect of means of their preservation, fall into grievous sins, and for a time continue therein, whereby they incur God's displeasure and grieve his Holy Spirit, come to have their graces and comforts impaired, have their hearts hardened, and their consciences wounded, hurt and scandalize others, and bring temporal judgments upon themselves…

And so this man commits adultery on his wife. He refuses to repent, despite the pleas of his elders and friends. He leaves his wife and is subsequently excommunicated. For two years we hear reports about this man; how he’s living with his lover, not attending church, and even saying he doesn’t believe. But one day you, a member of the church and a one time good friend, run into him at the local Starbucks. You guys chat a bit about how life is treating the both of you. It looks like a door may be open enabling you to get more personal in your conversation. What do you say to this man? Well, I think every Christian would agree that we would evangelize him. Tell him to know the Lord. Tell him that he needs to be saved. But here’s the rub, this guy, and yourself, are New Covenant members! My question is, what is one member of the New Covenant doing telling another New Covenant member to “know the Lord?”

Not only do we have a clear cut case of a New Covenant member telling another New Covenant member to “know the Lord,” the corollary of my reductio leads to a dangerous presumption. Say a member of your church is the most “holy” person you know. He is always giving of himself. Evidences what appear to be the fruit of the Spirit. Has continued to attend church for 35 years. Is always seen every morning reading his Bible and praying. Despite all of this, this man is deceiving everyone. He is putting on an outward show. To be consistent, the Baptist who interprets Jeremiah 31 in this overly-realized way cannot tell this man to “know the Lord.” Otherwise, he’d be telling someone he thought was a covenant member to “know the Lord,” and this is staunchly forbidden. Therefore the Baptist cannot tell a person to “know the Lord,” even if this is precisely what this person needs to hear!

The Baptist may say that we should tell everyone to “know the Lord” because we don’t know who the elect are. I agree, but this goes against their claim that in the New Covenant it is currently realized. If the New Covenant is fully realized then how is our telling New Covenant members to “know the Lord”, “not like” the Old Covenant? You see, only in the New Heavens and Earth will “each man no longer teach his brother or his neighbor to know the Lord.”
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Regards,

P.M.
PCA
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