What are the three groups Paul identifies in Romans 1-3?
The three groups are the immoral (or amoral), who have no morals; the moral man or woman; and the religious individual. God builds His case like a prosecuting attorney against all humanity, and His conclusion falls on all three: guilty. Paul then concludes in Romans 3 that none does good or righteousness, and all have become unprofitable.
Les explains that from this point until chapter 3, God is building His case against the whole human race, just like a prosecuting attorney. He categorizes humanity into three areas. The first group is the immoral, or amoral—those who have no morals whatsoever and are destitute of any morality. The next series of verses addresses the moral man or woman. Then comes the religious individual. The conclusion is the same for all three: guilty. Paul comes to that tremendous conclusion in Romans 3: “There is none that doeth good. There is none that doeth righteousness. They are all become unprofitable.” Les reminds his audience that he is not looking down his nose or judging, but simply showing what the Scripture says. God is building His case against all humanity, starting with those most obviously guilty, the immoral.