I don't disagree with this at all! It is indeed the gospel by which we are saved - no argument whatsoever! AMEN!
Consider this example from Acts 8 (verses 32-39):
32 Now the passage of Scripture which he was reading was this:
"HE WAS LED AS A SHEEP TO SLAUGHTER;
AND AS A LAMB BEFORE ITS SHEARER IS SILENT,
SO HE DOES NOT OPEN HIS MOUTH.
33"IN HUMILIATION HIS JUDGMENT WAS TAKEN AWAY;
WHO WILL RELATE HIS GENERATION?
FOR HIS LIFE IS REMOVED FROM THE EARTH."
34 The eunuch answered Philip and said, "Please tell me, of whom does the prophet say this? Of himself or of someone else?"
35 Then Philip opened his mouth, and beginning from this Scripture he preached Jesus to him.
Let me stop here and ask - what did Philip preach to this eunuch? I submit he preached to him the good news by which we are saved! What was the outcome of Philip's preaching? We read...
36 As they went along the road they came to some water; and the eunuch said, "Look! Water! What prevents me from being baptized?"
37 [And Philip said, "If you believe with all your heart, you may." And he answered and said, "I believe that Jesus Christ is the Son of God."]
38 And he ordered the chariot to stop; and they both went down into the water, Philip as well as the eunuch, and he baptized him. 39 When they came up out of the water, the Spirit of the Lord snatched Philip away; and the eunuch no longer saw him, but went on his way rejoicing.
Why was the eunuch so eager to be baptized? Why did he look upon the water with such zeal and ask "What prevents
me from being baptized?" And why did Philip oblige him? And, finally, why did the eunuch rejoice afterwards - or more properly - WHEN did the eunuch rejoice?
Friend, I submit that Philip
preached the gospel to this man and part of that gospel involved the eunuch's ability or opportunity (by God's grace) to participate in Jesus' death, burial, and resurrection.
"3 Or do you not know that all of us who have been baptized into Christ Jesus have been baptized into His death?
4 Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life.
5 For if we have become united with Him in the likeness of His death, certainly we shall also be in the likeness of His resurrection,
6 knowing this, that our old self was crucified with Him, in order that our body of sin might be done away with, so that we would no longer be slaves to sin;
7 for he who has died is freed from sin." (Romans 6)
Is not this something over which to rejoice? Becoming united with Christ? Dead to sin? Absolutely it's something over which to rejoice!
Or what of this example:
28 But Paul cried out with a loud voice, saying, "Do not harm yourself, for we are all here!"
29 And he called for lights and rushed in, and trembling with fear he fell down before Paul and Silas,
30 and after he brought them out, he said, "Sirs, what must I do to be saved?"
31 They said, "Believe in the Lord Jesus, and you will be saved, you and your household."
Interruption - believe what? To what is he referring?
32 And they spoke the word of the Lord to him together with all who were in his house.
Again I interrupt to ask what was this "word of the Lord" that Paul spoke to these people?
It was the gospel, of course! And it was the word of the Lord in which he/they was/were to believe.
33 And he took them that very hour of the night and washed their wounds, and immediately he was baptized, he and all his household.
34 And he brought them into his house and set food before them, and rejoiced greatly, having believed in God with his whole household. (Acts 16)
...immediately he was baptized - and he rejoiced greatly - "having believed in God"!
(1 Timothy 1:14) Yet the grace of our Lord overwhelms, with faith and love in Christ Jesus.
He overwhelms our previous doubt and unbelief with faith and love in Christ.
(Ephesians 2:8) For in grace, through faith, are you saved, and this is not out of you; it is God's approach present, not of works, lest anyone should be boasting. For His achievement are we, being created in Christ Jesus for good works, which God makes ready beforehand, that we should be walking in them.
We are saved in God's grace, his gratuitous undeserved favor. This grace, is through faith in the evangel. This is how we have it. Faith in the evangel. It is not out of us. The faith did not come into us from out of nowhere or because we were wise enough to apprehend that it is true, but directly from God. If it were sourced in us, we would have something to boast in, but it is his approach present. He called us and placed us in his Son.
Amen we are saved by His grace - by His unmerited, undeserved favor! And nothing else. And amen is such grace "overwhelming" - overpouring in rejoicing on the part of the one who hears His word, believes it, and obeys it. Amen!
Now, in that grace we should do all we can for the Lord. Not because our salvation is at stake, but because the evangel and us believing it was all completely undeserved and from God for no reason in ourselves and so that will bring us to do good works for others when it seems that there is no reason to do so. When we stay nourishing ourselves with words of faith and the sound teaching we will act in way that will bring more glory to God through this evangel, but as we fail to do that our behavior and attitude may not be the ideal. Nevertheless, to him who is not working, yet is believing on Him Who is justifying the irreverent, his faith is reckoned for righteousness (Romans 4:5). He will not bring glory to God, but he is saved. Where sin increases, grace superexceeds (Romans 5:20). That is how wonderful and full of love and grace our God is. That he saves us and whether we sin or do his will, he still will save us.
Thank you for reading all the way through if you did. I hope I was more of a help than a hinderance.
I did read everything, as I hope you will see. I did snip a number of verses for brevity's sake.
Friend, I suspect you believe that a gospel message that includes the command for the believer to submit to baptism is somehow a "work" and somehow "negates God's grace." Nothing could be further from the truth. Indeed, the gospel message, the "word of the Lord" begins with the admonition (from His own lips):
"15 And He said to them, "Go into all the world and preach the gospel to all creation.
16 "He who has believed and has been baptized shall be saved; but he who has disbelieved shall be condemned." (Mark 16)
"Believed" what? The gospel!
This is what happened to the eunuch (read it again, if you doubt...);
it is what happened to the jailer (read it again, if you doubt);
it is what happened to the 3,000 after Peter's first sermon (read Acts 2:36ff again, if you doubt);
it is what happened to Paul (Acts 9, Acts 22, if you doubt),
to Lydia (Acts 16 if you doubt),
to Cornelius (Acts 10)...
Here indeed is the prerequisite for salvation - hearing the word of Christ - for
"faith comes from hearing, and hearing by the word of Christ" (Rom 10:17) The gospel is the word of Christ, the word about Christ and what Christ did for us and what we need to do (believe) to obtain this gracious opportunity to salvation.
There is no doubt Jesus, Peter, Paul, Philip, et. al. preached the gospel and that the gospel included the message about God's gracious opportunity to us to partake in His death, burial, and resurrection by submitting to (obeying) the gospel (the word of Christ) message and being baptized. It is not a work we do; it does not negate His grace - it is His grace. Baptism is the gospel, the essence of the gospel message (I Cor 15) IS baptism, and I pray He open your heart and everyone's heart to see the truth in His word.
"The sum of Thy Word is truth..." Psalm 119:160