Christian, do you feel compelled to "invite your unbelieving friend to 'church'?" Why so? Does darkness have fellowship with the light? (2 Cor. 6:14) Does an unbeliever have spiritual gifts with which to edify the body? (1 Cor. 12:7) Can one who dines at tables of demons also feast upon the Lord's supper? (1 Cor. 10:21)

When we gather as the Church (we are the Church, we don't go to church), we come together to separate from the world for a time, to refresh, to fellowship, to edify one another. Why then intentionally ask those who are not of Christ into our midst? This is not how the Church operated in the time of the apostles. (Acts 5:13)

Yes, they may end up there by happenstance, but it is not for us to ask them nor to accomodate them. (1 Cor. 14:23-25) Focus instead on serving the body as you have been called, using your gifts to edify the body, growing in fellowship with God and one another, and go out and take the gospel to the lost. Then when the lost receive Christ, let them indeed join our fellowship. (Acts 5:14)

This is the way the apostles worked and taught. This is the example we should follow.
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Spurgeon's Morning and Evening Devotions

Morning, August 18

"Strangers are come into the sanctuaries of the Lord's house." Jeremiah 51:51

In this account the faces of the Lord's people were covered with shame, for it was a terrible thing that men should intrude into the Holy Place reserved for the priests alone. Everywhere about us we see like cause for sorrow. How many ungodly men are now educating with the view of entering into the ministry! What a crying sin is that solemn lie by which our whole population is nominally comprehended in a National Church! How fearful it is that ordinances should be pressed upon the unconverted, and that among the more enlightened churches of our land there should be such laxity of discipline. If the thousands who will read this portion shall all take this matter before the Lord Jesus this day, He will interfere and avert the evil which else will come upon His Church. To adulterate the Church is to pollute a well, to pour water upon fire, to sow a fertile field with stones. May we all have grace to maintain in our own proper way the purity of the Church, as being an assembly of believers, and not a nation, an unsaved community of unconverted men.

Our zeal must, however, begin at home. Let us examine ourselves as to our right to eat at the Lord's table. Let us see to it that we have on our wedding garment, lest we ourselves be intruders in the Lord's sanctuaries. Many are called, but few are chosen; the way is narrow, and the gate is strait. O for grace to come to Jesus aright, with the faith of God's elect. He who smote Uzzah for touching the ark is very jealous of His two ordinances; as a true believer I may approach them freely, as an alien I must not touch them lest I die. Heartsearching is the duty of all who are baptized or come to the Lord's table. "Search me, O God, and know my way, try me and know my heart."