How does a person get into the ' body of Christ ' ?

Now pay attention:

41 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.

42 And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers.

43 And fear came upon every soul: and many wonders and signs were done by the apostles.

44 And all that believed were together, and had all things common;

45 And sold their possessions and goods, and parted them to all men, as every man had need.

46 And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart,

47 Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.

Galatians 3:27 For all of you who were baptized into Christ have clothed yourselves with Christ.

1 Corinthians 12:13 For by one Spirit we were all baptized into one body, whether Jews or Greeks, whether slaves or free, and we were all made to drink of one Spirit.

Even though it will be argued about I will follow the scriptural pattern and teach that Baptism in water is included in these references to Baptism in the scriptures as it relates to being added to the church. We see that in Acts 2 which sets the pattern. Though it is definitely the invisible faith related spiritual aspect of that act that is also emphasized nevertheless the reference to baptism in water is included and often simply assumed since baptism in water was a normal thing that was taught, practiced and every Christian took part, There is of course an invisible spiritual reality of what the Spirit does in the heart of the believer in adding him/her to the church. As a matter of fact baptism in water was a matter of immediate urgency in the New Testament but has become almost a "when you get around to it" option today that should be restored without putting more emphasis on the act than faith in Jesus. Now y'all can go ahead and argue about it, I am not confused and I won't waste time arguing about it. I will just baptize new converts and let the arguers argue about it until Jesus comes, meanwhile new converts will be getting baptized in water in my church every Sunday, or at least that is one of the goals.

'any man that does not have The Spirit of Christ, is none of His'.
(Repent-be baptized) and you shall receive the GIFT of The Holy Spirit'.
Acts. 2:38.
one has to BELIEVE that HE IS, or they can never 'come to Him' -
and no man can come to Him, unless The Father draws him'...

The reason Paul said they were carnal was that their were divisions among them not because they were worldly. I am not trying to split hairs but sometimes I hear people talk as if they think that Paul said willfully indulging in the lusts of the flesh because you don't want to give up the pleasure of sin is a carnal Christian. But that is not what he was talking about.

1 Cor 3:3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?

So it is true that many of those who fall into the sin of arguing with strangers on the internet here on CC are carnal Christians, it is not true that this is OK.

We are saved by grace received through faith. Eph 2:8-9 We cannot merit salvation we do not deserve salvation. Salvation and being added into the body of Christ are the same thing.

Water baptism does not contribute to salvation. Holy Spirit baptism is the means by which Christ adds us to the body. Titus 3:5 I am all for water baptism after salvation in the order that Philip baptized the eunuch in Acts 8:31-39.

The blood of Christ provides the atonement for our sins. The grace of God makes the atonement efficacious for each individual soul that surrenders itself to the will of God and trusts Christ for salvation.

John 3:16-17 is the gospel in a concise form and can be explained in under 2 minutes.

For the cause of Christ
Roger

Short answer, believe and be baptized.

And the resurrection?

Ephesians 1:13 covers it.
“In Him you also trusted, after you heard the word of truth, the gospel of your salvation;
in whom also, having believed, you were sealed with the Holy Spirit of promise,”
‭‭Ephesians‬ ‭1:13‬ ‭NKJV‬‬
https://www.bible.com/114/eph.1.13.nkjv
The only requirements given here are to hear the word and believe it.

Short answer, believe and be baptized.

Jesus had a connection to us before we were born. We were in Him. That gives Jesus a way to access all sins.

Believe what?

If we were in him ,how did we get out of him ?
Eph 2
12That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:

What if he loses you again?

The Truth, what Jesus said and what He represents. The Truth instead of the lie that satan gave us.

And what of it?

For the cause of Christ
Roger

Truth about what specifically?

About reconnecting to God the Father. About not being about ourselves anymore. About not desiring anything from this fallen place.