1) v18 says the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men. This is seen in the way they suppress the truth.
According to the text v18-23, how is the truth suppressed? How do you see the truth suppressed in our world today?
2) 3 times it is mention "God gave them up." v24, v26, v28.
What does that phrase mean? Why is it such a terrible thing that God would give them up to those things?
3) There's a list of unrighteous deeds in v29-31. Examine the list. Has those things listed become worse in our world over generations? Do you see these sins around you today? Give examples.
4) What is God's judgment for these ungodly and unrighteous deeds? How do you feel about that?