The purpose of being a Christian is to have the forgiveness of our sins and therefore have a promise of eternal life. The forgiveness of sins are found only in Christ, which means in his body the church.
Eph 1:3, Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ,
Eph 1:7, In Him we have redemption through His blood, the forgiveness of our trespasses, according to the riches of His grace.
Eph 1:22, And He put all things in subjection under His feet, and gave Him as head over all things to the church,
23 which is His body, the fullness of Him who fills all in all.
Gal 3:26, For you are all sons of God through faith in Christ Jesus.
27 For all of you who were baptized into Christ have clothed yourselves with Christ.
2 Cor 5:17, Therefore if anyone is in Christ, he is a new creature; the old things passed away; behold, new things have come.
Romans 6:3, Or do you not know that all of us who have been baptized into Christ Jesus have been baptized into His death?
4 Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life.
5 For if we have become united with Him in the likeness of His death, certainly we shall also be in the likeness of His resurrection,
6 knowing this, that our old self was crucified with Him, in order that our body of sin might be done away with, so that we would no longer be slaves to sin;
7 for he who has died is freed from sin.
8 Now if we have died with Christ, we believe that we shall also live with Him,
9 knowing that Christ, having been raised from the dead, is never to die again; death no longer is master over Him.
10 For the death that He died, He died to sin once for all; but the life that He lives, He lives to God.
11 Even so consider yourselves to be dead to sin, but alive to God in Christ Jesus.
When we are baptized into Christ we become members of his church, He adds us to it, we do not join it.
Acts 2:41, So then, those who had received his word were baptized; and that day there were added about three thousand souls.
42 They were continually devoting themselves to the apostles’ teaching and to fellowship, to the breaking of bread and to prayer.
43 Everyone kept feeling a sense of awe; and many wonders and signs were taking place through the apostles.
44 And all those who had believed were together and had all things in common;
45 and they began selling their property and possessions and were sharing them with all, as anyone might have need.
46 Day by day continuing with one mind in the temple, and breaking bread from house to house, they were taking their meals together with gladness and sincerity of heart,
47 praising God and having favor with all the people. And the Lord was adding to their number day by day those who were being saved.
As members of the Lords’ church we have a responsibility to help carry out the mission of the church, which is to take the gospel to the lost.
1 Cor 16:2, Now concerning the collection for the saints, as I directed the churches of Galatia, so do you also.
2 On the first day of every week each one of you is to put aside and save, as he may prosper, so that no collections be made when I come.
3 When I arrive, whomever you may approve, I will send them with letters to carry your gift to Jerusalem;
4 and if it is fitting for me to go also, they will go with me.
2 Cor 9:6, Now this I say, he who sows sparingly will also reap sparingly, and he who sows bountifully will also reap bountifully.
7 Each one must do just as he has purposed in his heart, not grudgingly or under compulsion, for God loves a cheerful giver.
8 And God is able to make all grace abound to you, so that always having all sufficiency in everything, you may have an abundance for every good deed;
The Lord expects us as newborn Christians to grow spiritually:
Heb 5:11, Concerning him we have much to say, and it is hard to explain, since you have become dull of hearing.
12 For though by this time you ought to be teachers, you have need again for someone to teach you the elementary principles of the oracles of God, and you have come to need milk and not solid food.
13 For everyone who partakes only of milk is not accustomed to the word of righteousness, for he is an infant.
14 But solid food is for the mature, who because of practice have their senses trained to discern good and evil.
2Peter 1:2, Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord;
3 seeing that His divine power has granted to us everything pertaining to life and godliness, through the true knowledge of Him who called us by His own glory and excellence.
4 For by these He has granted to us His precious and magnificent promises, so that by them you may become partakers of the divine nature, having escaped the corruption that is in the world by lust.
5 Now for this very reason also, applying all diligence, in your faith supply moral excellence, and in your moral excellence, knowledge,
6 and in your knowledge, self-control, and in your self-control, perseverance, and in your perseverance, godliness,
7 and in your godliness, brotherly kindness, and in your brotherly kindness, love.
8 For if these qualities are yours and are increasing, they render you neither useless nor unfruitful in the true knowledge of our Lord Jesus Christ.
9 For he who lacks these qualities is blind or short-sighted, having forgotten his purification from his former sins.
10 Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble;
Without attending church services where these things are taught, where we receive strength from other members and worship God, we cannot grow.
Wanting to be a member without attending church services would be like wanting to be a member of Alcoholics Anonomous without attending the meetings.
We have to attend church services in order to grow spiritually, we have to grow spiritually in order to be pleasing unto God, and we have to be found pleasing unto God in order to receive heaven as our reward.
Heb 10:24, and let us consider how to stimulate one another to love and good deeds,
25 not forsaking our own assembling together, as is the habit of some, but encouraging one another; and all the more as you see the day drawing near.
Scripture references are from NASV 95