On that confessed belief, one is baptized and becomes a member of the church.
Not sure where you get that teaching, for you certainly did not get it from the scriptures themselves~most likely from the "church" you are part of, it must be one of "their" doctrines.
Acts 8:35-40~"Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus. And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized? And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God. And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him. And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing. But Philip was found at Azotus: and passing through he preached in all the cities, till he came to Caesarea."
This portion of scriptures reveals a few truths to us about water baptism, the believer, and the church of God/Christ.
Philip meets a great eunuch of Ethiopia prepared by the Holy Ghost for conversion
The Lord directs Philip to the desert, which direction we need for godly conversions. This man was an important government official, but he was a black, castrated Gentile.
The eunuch had been worshipping in Jerusalem
as a proselyte of the Jews’ religion. While in Jerusalem, he secured a copy of part of the Old Testament and read Isaiah.
With Divine prompting, Philip joins himself to this man’s chariot prepared by God. The Lord had taken care of details, he was reading Isaiah 53 without understanding
With the heart of a righteous man
, the eunuch desires Philip to teach him the Scripture.
The Lord set Philip up perfectly. The eunuch wanted to know the Subject of Isaiah 53. Philip preaches Christ Jesus to the noble eunuch and baptizes him in the desert (Acts 8:35-38).
What a passage to preach Christ Jesus! The Lord had prepared the eunuch perfectly. After hearing about baptism, the eunuch spies some water and seeks his own baptism.When God is in the matter, you will not need to use natural means to push conversion
. The eunuch asks a perfect question about baptism~what is the necessary condition?
Baby-sprinkling heretics wish there was no answer to this important question. So they deleted Acts 8:37 from most every version of the Bible but the KJV.
Baptists and a few others hold to “believers’ baptism” because of this and other similar verses.
Baptism is the answer of a good conscience (Ist Peter 3:21), which rejects babies. The eunuch also chose water deep enough to baptize Scripturally~ by immersion. As John baptized in Aenon for the much water there (John 3:23), so Philip.
Both Philip and the eunuch had to go down into the water for a godly baptism. Both Philip and the eunuch had to come up out of the water after the baptism. In this important passage, we condemn infant baptism and any mode but immersion. The eunuch, having obeyed Jesus Christ, goes on his way to Ethiopia rejoicing.
Is there something missing? Not one thing is mention about JOINING A CHURCH, either back in Jerusalem or in his own country. So we must conclude baptism and "joining" a church are not one and the same event or even connected, or more than that~there is NO SUCH DOCTRINE of joining a church in the sense in which it is taught in our day.
Joining OUR PRESENCE with other believers so that we come and go out among them we WOULD AGREE~and this fellowship we should not forsake, but other than this, there is no such doctrine taught in the word of God.
Acts 9:26-28~"And when Saul was come to Jerusalem, he assayed to join himself to the disciples: but they were all afraid of him, and believed not that he was a disciple. But Barnabas took him, and brought him to the apostles, and declared unto them how he had seen the Lord in the way, and that he had spoken to him, and how he had preached boldly at Damascus in the name of Jesus. And he was with them coming in and going out at Jerusalem."
Church memberships as it is taught in our day is a doctrine of men.
Colossians 4:9~"With Onesimus, a faithful and beloved brother, who is one of you. They shall make known unto you all things which are done here."
Disciples DID go in and out among believers in their cities, towns, etc.
But their baptism was strictly between them and God
which only needed a person of the faith/religion of JESUS CHRIST doing the baptism~which religion we are baptized INTO by another believer.
Acts 9:10~"And there was a certain disciple at Damascus, named Ananias; and to him said the Lord in a vision, Ananias. And he said, Behold, I am here, Lord."
Ananias baptized one of the greatest disciples ever in baptizing the apostle Paul would was nothing more than a disciple himself. So much for needing an ordained minister doing the baptism!