And again you assume that Paul lists everything that he taught that was right, true, or profitable in these two verses. But he doesn't, he can't, because there is much more that is profitable, true, and right than will fit in just two verses.
Jesus said it, Paul said it, Peter said it, John said it, Luke said it; you don't want to agree with it, but it is truth. And yes, Rom 6 and Col 2 both state that the Holy Spirit removes our sins during water baptism (since water baptism is the one baptism of the NT Church).
Ahh, so here it is water baptism, but in Rom 6 and Col 2 it is not, got it.
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Clearly you read what you want to hear in Scripture instead of what it actually says.
No, Paul is not saying that baptism is not important. But he did not come to town to reap a harvest. He came to plant the Seed. He knew that others would come later to harvest the crop. A farmer doesn't go out in May to reap a harvest. He goes out to till the soil. Then later he plants. Then later he waters, and cultivates, and weeds, and tends to the fields. And in August he goes out to harvest the increase. Paul knew it was only May (metaphorically) when he went to Corinth, so he went to plant the Seed, not expecting to reap a harvest immediately.