Again, it is important to note tha Paul does not bring a universal indictment against humanity for the failure to know God. That is not our problem. It is not that we fail to know that God is and who God is; it is that we refuse to believe what we know to be true. Here we face a problem that is not an intellectual problem. It is a moral problem It is the problem of dishonesty.
– R.C. Sproul, The Holiness of God, Tyndale House Publishers, Carol Stream, Ill., Copyright 1985, Kindle Edition