1 Peter 3:21, ἀλλὰ συνειδήσεως ἀγαθῆς ἐπερώτημα εἰς θεόν, “but the appeal (request) of a good conscience unto God.” The phrase “not the putting away the filth of the flesh, but the appeal of a good conscience unto God”, is parenthetical. Once we see that, we can see the connection between baptism and the resurrection of Christ.
ἐπερώτημα does not mean “answer” as the King James suggests. Rather, it means to appeal, demand, question, or request. In the broader context of the passage, baptism points back to Israel’s Red Sea Crossing, but also to Jesus’ resurrection from the dead. In baptism, the conscience is appealing to God (or, God is appealed to on behalf of the conscience) to give to him or her what is demonstrated in baptism: namely, the benefits obtained through the work of Christ, i.e. salvation in all its fullness. And God responds, the passage tells us, by giving what is demonstrated and promised in baptism - He gives the benefits of the finished work of Christ. “Which also is baptism, the antitype, now saving you (y’all).” People get hung up on the phrase “not the putting away of the filth of the flesh”. But that doesn’t mean that it’s baptism, but not physical baptism. It means that washing dirt off of your body doesn’t save you - baptism isn’t like your morning shower. It is an external symbolic act with spiritual effects.
Everybody, even the Baptist, demonstrates implicitly that they believe something transitional is happening in the act of baptism. The person being baptized transitions from one state of being to another. The person moves from being someone who is not baptized to being someone who is baptized. And so baptism does do something, contrary to the Baptist’s protests. Anybody that has spent time in Baptistic circles knows this.