They weren't believers?! LOLOL The letter was written to the believers in Rome.
Romans 6:1-4
What shall we say, then? Shall we go on sinning so that grace may increase? 2 By no means! We are those who have died to sin; how can we live in it any longer? 3 Or don’t you know that all of us who were baptized into Christ Jesus were baptized into his death? 4 We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life.
I will not debate with you further. You twist to suit your premise.
Romans 6:1-2 is Paul explaining to the Romans the objections to grace that he faced. Don’t you get that? What do you think Romans 6:1-2 is?
Your objection is the same as the objection Paul faced as he portrays in Romans 6:1-2. And Scripture’s answer to you is the same as Paul’s answer to them - the answer you laid out in you last response, but fail to comprehend how it refutes the objections about sinning willy-nilly.