This idea or some variation of it proliferates the greater Christian world. I can’t figure out why.
The Pre-Jesus movement was characterized by baptism.
John appeared, baptizing in the wilderness and proclaiming a baptism of repentance for the forgiveness of sins. And all the country of Judea and all Jerusalem were going out to him and were being baptized by him in the river Jordan, confessing their sins. Mark 1:4-5 ESV
The Jesus’ movement began with his own baptism.
But Jesus said, “It should be done, for we must carry out all that God requires.” So John agreed to baptize him. Matthew 3:15 NLT
Jesus’ last words command baptism.
“All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.” Matthew 28:18-20
The apostles started the church with baptism.
Peter replied, “Each of you must repent of your sins and turn to God, and be baptized in the name of Jesus Christ for the forgiveness of your sins. Then you will receive the gift of the Holy Spirit. This promise is to you, to your children, and to those far away—all who have been called by the Lord our God.” Then Peter continued preaching for a long time, strongly urging all his listeners, “Save yourselves from this crooked generation!”
Those who believed what Peter said were baptized and added to the church that day—about 3,000 in all. Acts 2:38-41
The early church assumed all believers were baptized.
When we were joined with Christ Jesus in baptism… Romans 6:3
Baptism unleashes spiritual power we cannot comprehend.
For in Christ all the fullness of the Deity lives in bodily form, and in Christ you have been brought to fullness. He is the head over every power and authority. In him you were also circumcised with a circumcision not performed by human hands. Your whole self ruled by the flesh was put off when you were circumcised by Christ, having been buried with him in baptism, in which you were also raised with him through your faith in the working of God, who raised him from the dead.
When you were dead in your sins and in the uncircumcision of your flesh, God made you alive with Christ. He forgave us all our sins, having canceled the charge of our legal indebtedness, which stood against us and condemned us; he has taken it away, nailing it to the cross. And having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross. Colossians 2:9-15
So please, dear one, if you call your self a Christian, please stop saying baptism isn’t necessary. Everything Jesus said, did and promoted is necessary if we want to belong to him.