The problem with your theory is that it missed the glaring difference between Peter's gospel in Acts 2 and Paul's gospel in 1 Cor. 15:1-4. Peter specifically stated to Israel the requirement to be baptized unto the remission of sins. Paul's gospel to the Gentiles made no such demands. Paul even argued that any work for salvation nullifies it being by grace. So, it really is not that hard to see the differences apart from accusing Paul for the sin of omission in relation to a writing he had to have known was for posterity.
The lazy argument that has been put forth in other postings is that Paul was allegedly summerizing. That argument is less than pathetic in the agenda behind trying to harmonize things that are not similar in every respect.
MM
The lazy argument that has been put forth in other postings is that Paul was allegedly summerizing. That argument is less than pathetic in the agenda behind trying to harmonize things that are not similar in every respect.
MM
11 For it hath been declared unto me of you, my brethren, by them which are of the house of Chloe, that there are contentions among you.
12 Now this I say, that every one of you saith, I am of Paul; and I of Apollos; and I of Cephas; and I of Christ.
13 Is Christ divided? was Paul crucified for you? or were ye baptized in the name of Paul?
14 I thank God that I baptized none of you, but Crispus and Gaius;
15 Lest any should say that I had baptized in mine own name.
16 And I baptized also the household of Stephanas: besides, I know not whether I baptized any other.
17 For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.
18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
If Paul was against baprism, why did he baptise? Paul gives the reason why he avoided baptism: so that people would not mistake baptism by him as baptism into his sect. He left baptism to his assistants to perform on converts..
Act 9:18
And immediately there fell from his eyes as it had been scales: and [Paul] received sight forthwith, and arose, and was baptized.
Act 16:15
And when [Lydia] was baptized, and her household, she besought us, saying, If ye (Paul and his companions] have judged me to be faithful to the Lord, come into my house, and abide there. And she constrained us.
Act 16:33
And [the jailor] took them the same hour of the night, and washed [Paul's and Silas'] stripes; and was baptized, he and all his, straightway.
People who believed Paul's gospel were baptised by Paul's assistants.