Abraham had 2 sons: one of the flesh and one of the promise of God
The church is made up of the people who are the seed of the promise of God.
John baptized in water. Jesus baptized in the Holy Ghost and fire.
Some people at church have only been baptized in water. This is the child of the flesh, created by the will of man.
Those baptized by Jesus are baptized in the Holy Ghost and fire. These are the children of the promise.
John the Baptist said:
Matthew 3:11 I indeed baptize you with water unto repentance. but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: HE shall baptize you with the Holy Ghost, and with fire:
Jesus said:
Acts 1 ...4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me. 5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
John's baptism was of water unto repentance and was done by the will of man. These are the children of Ishmael, of the flesh, of the will of man.
Jesus' baptism was with the Holy Ghost and fire. Those who have been baptized with the Holy Ghost and fire are the children of the promise that God gave to Abraham concerning Isaac and these, today, are the real children of Israel, the children of the promise.,
Jude ... 17 But, beloved, remember ye the words which were spoken before of the apostles of our Lord Jesus Christ; 18 How that they told you there should be mockers in the last time, who should walk after their own ungodly lusts. 19 These be they who separate themselves, sensual, having not the Spirit.
These are the ones who join churches and go forward and are baptized in water but no real changes takes place in their lives. They copy others who seem religious. Thus they are "mockers", imitators of others but they don't have the Spirit of God. They have only been baptized in water by the will of man. They have not been baptized with the Holy Ghost and fire, Jesus' baptism.
Acts 19 ... 1 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus:and finding certain disciples, 2 He said unto them, Have ye received the Holy Ghost since ye believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost. 3 And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism. 4 Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus. 5 When they heard this, they were baptized in the name of the Lord Jesus. 6 And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied. 7 And all the men were about twelve.
I was baptized in water when I was 15. Nothing happened. I thought I was a Christian but I was not. Then when I was 37, everything changed. God spoke to me by HIS Spirit ... "Joan, you know all these mistakes you've been making all these years? Those weren't mistakes. Those were sins." I was stunned! I was changed immediately. This was baptism of the Holy Ghost and fire which comes from Jesus as spoken of by John the Baptist in Mt. 3:11. This baptism was not by my own will. It was not by the will of man. Therefore this baptism was not of the flesh as was the first baptism in water.
Paul says:
Romans 9 ... For they are not all Israel, which are of Israel:7 Neither, because they are the seed of Abraham, are they all children:but, In Isaac shall thy seed be called. 8 That is, They which are the children of the flesh, these are not the children of God:but the children of the promise are counted for the seed.