Romans 1:19

1:19 because what can be known about God is plain to them, because God has made it plain to them.

Romans 3:20

3:20 For no one is declared righteous before him by the works of the law, for through the law comes the knowledge of sin.

Romans 1:21

1:21 For although they knew God, they did not glorify him as God or give him thanks, but they became futile in their thoughts and their senseless hearts were darkened.

Romans 8:7

8:7 because the outlook of the flesh is hostile to God, for it does not submit to the law of God, nor is it able to do so.