Here is the awful penalty of frustrating the doctrine of the grace of God by adding works. One should answer every rhetorical questions that Paul asks in this epistle and if he does not answer correctly he should fear for his soul and repent. I did not write this but my reading ability is higher than the moon.
Ga 1:6 I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.
8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
9 As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed.
20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
21
I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain.
Salvation is Christ living in the body in the person of the Spirit and he does not indwell the body at baptism, he indwells the body at believing in the heart. It is a new birth and all things become new when it happens.
This is truth. Baptism in water adds nothing to the transaction but it does illustrate it.