The Importance of Baptism in Romans 6

In romans six, Paul says that his praise is not from man, but from god. The jews have an advantage in that they've had these oracles, and they're familiar with what the scripture teaches and promises. And so he goes on verse five, but if our unrighteousness serves to show the righteousness of god, what shall we say that god is unrighteous to inflict wrath? This is paul in parenthesis saying, i'm just speaking. I'm giving an argument, rhetorical here, by no means for then how could god judge the world?