God’s wrath is the counterpart to His righteousness. Paul’s argument is this: God’s wrath is deserved by all men because they have refused the revelation of God and His righteousness.
Let’s first look at two major reason why the heathen are lost:
THE HEATHEN ARE LOST BECAUSE OF THEIR REVELATION OF GOD
Romans 1:18-19 (NKJV) - For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness, because what may be known of God is manifest in them, for God has shown it to them.
In the first three verses of this passage Paul says that man has revelation of God which has been manifested within them and shown to them, and because of that revelation, man is without excuse.