Background for this post:
Verses 22-23 are so sad; they basically talk about when humans first started making and worshiping idols:
"Professing to be wise, they became fools, and changed the glory of the incorruptible God into an image made like corruptible (perishable) man - and birds and four-footed animals and creeping things."
At this point, they didn't have the 10 Commandments or a Bible or anything. They "only" had God's creation to see and His interaction with them. Verse 20 says this should have been enough!
"For since the creation of the world God's invisible qualities - His eternal power and divine nature - have been clearly seen, being understood from what has been made, so that men are without excuse."
How sad. . . becoming so focused on themselves that they became blind to God and decided to create their own versions of what "god" should be. They turned from the creator to start worshiping the created (verse 25). And this caused them to just give themselves up to all kinds of consuming sin (verses 26-32).
Moral of the story: Don't take our eyes off God!