For God sent not His Son into the world to condemn the world; but that the world through Him might be saved. (John 3:17)
The church [the body of Christ] has several important functions which include worship, fellowship, and ministry to human need. But the primary purpose for its existence is spreading of the Gospel. Simply stated, the main purpose of the Church is to fulfill the Great Commission.
For the poor always ye have with you; but me ye have not always. John 12:8
The Church can seek to meet human need and it should be a vital, caring community as it was in New Testament times. But the purpose of the Church does not rest in meeting physical, social, or material needs. Its priority is spreading the Gospel. The Church should minister to other needs, but should combine such efforts with a powerful presentation of the Gospel message.
Brethren, my heart's desire and prayer to God for Israel is that they may be saved. Romans 10:1
The mission of the Church is to make the Gospel known so God can be faithfully served by all men.
For God so loved the world that He gave His only begotten Son that whosoever believeth in Him should not perish but have everlasting life. For God sent not His Son into the world to condemn the world; but that the world through Him might be saved. (John 3:16-17)
We are ministers of reconciliation. We are to follow the pattern set by God and exemplified by Jesus. We are to go forth with the Gospel.
Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. For it is God which worketh in you both to will and to do of his good pleasure. Do all things without murmurings and disputings: That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world; Holding forth the word of life; that I may rejoice in the day of Christ, that I have not run in vain, neither laboured in vain. Philippians 2:12-16
Similar words were spoken to the churches at Corinth, Ephesus, Thessalonica, and Colossee. The same message rings forth today.
And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ; To the intent that now unto the principalities and powers in heavenly places might be known by the Church the manifold wisdom of God. According to the eternal purpose which He purposed in Christ Jesus our Lord. (Ephesians 3:9-11)
But ye shall receive power after that the Holy Ghost is come upon you; and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth. (Acts 1:8)
And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ: (Ephesians 4:11-13)
Now there are diversities of gifts, but the same Spirit. And there are differences of administrations, but the same Lord. And there are diversities of operations, but it is the same God which worketh all in all. But the manifestation of the Spirit is given to every man to profit withal. (1 Corinthians 12:4-7)
Getting 'in church' or 'joining' a church should be viewed as coming into the body of Christ - working in unity and harmony with other members of the body of Christ for the sole purpose of reaching out to others who are lost, not becoming isolated within. Tear down the wall and be like Jesus in helping others to be saved. This is done by going out and bringing others in.