Romans, in my opinion, is one of the richest books in the Bible. There is so much packed into a small package here. So as you read it if you feel that you are jumping around from one subject to another - you are probably right. Here are a few of my observations from Rom. 1:18 - 32.
If sinners can see God in creation, do those of us who know Jesus personally bother to look too?
Roman culture was full of paganism (worship of false gods). So are we surrounded by sinners who sin or pagans who are worshipping false gods? Do we even need to know that there is a difference?
I don't know how many times I have said, "But for the grace of God go I." So why didn't I go down the wrong path and walk away from God?
Why does Satan have a better PR department? He makes being depraved, even it if sends you to hell, look better than serving Jesus.