Heh .. Buddy Christ.
You know, aside from gross idolatry described in Romans 1, I think the truth that is suppressed is God’s Holiness, that He is “Holy, Holy, Holy”.
Which is to say I’ve long contrasted those in this passage in Romans 1 with Isaiah at his commissioning ... so that those who will not repent are the polar opposites to Isaiah.
If I were to guess at the one thing that makes reprobate so very reprobate is that, believing their poo don’t stink (in Isaiah-like speak they’re “good folks out of a people of hep cats”), they basically think they will be found right though God be made out a liar. Those with a reprobate mind think they have nothing to repent of and thus no need for some coal from the altar.
Scripture says God doesn’t change.
A reprobate say to God that it won’t change,
It won’t end well.