Rom 1 :
[SUP]18 [/SUP]For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness,
It says they freely chose to suppress the truth. One can not supress the truth if they can not understand it.
[SUP]19 [/SUP]because what may be known of God is manifest in them, for God has shown it to them. [SUP]20 [/SUP]For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse,
God has shown it to them. And it is clearly understood (not like some say and unable to be understood) Thus they are without excuse. If they can not understand and comprehend it all. THEY HAVE AN EXCUSE
[SUP]22 [/SUP]Professing to be wise, they became fools, [SUP]23 [/SUP]and changed the glory of the incorruptible God
God did not change it. they did. By their will
[SUP]25 [/SUP]who exchanged the truth of God for the lie,
They exchanged the truth for a lie. God did not hide it from them, or make it so they could not understand
[SUP]28 [/SUP]And even as they did not like to retain God in their knowledge,
They freely chose not to retain the knowledge of God. Again, God did not keep it from them
[SUP]32 [/SUP]who, knowing the righteous judgment of God, that those who practice such things are deserving of death
Again they know full well. God did not hide it. If they can know this, they can seek truth. This spoke of every one of us at one time in our lives.. The ones who come to Christ are the ones who stop hiding the knowledge of God in sin, and turn to God for help!