All people have knowledge of God by nature; they know that God exists and have some idea of His attributes and of His holy will.
This knowledge is born and preserved in this way: A person sees God’s works of creation and sees how God, in a wondrous way, governs all Creation, guides and leads individual nations, and controls the destiny of all mankind. In addition every person has a conscience that testifies that he or she is accountable to God.
Thus everyone has a natural knowledge of God. No one, however, as a result of this knowledge, longs for the Gospel of Christ, nor can be saved through this knowledge. All people continue to live with an accusing conscience, unless they hear and believe the Gospel.
Heb. 3:4: Every house is builded by some man, but He that built all things is God.
Ps. 19:1: The heavens declare the glory of God, and the firmament sheweth His handywork.
Rom. 1:19-20: That which may be known of God is manifest in them; for God hath showed it unto them. For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse.
Rom. 2:15: The Gentiles show the work of the Law written in their hearts, their conscience also bearing witness, and their thoughts meanwhile accusing or else excusing one another.
Acts 14:16-17: In times past (He) suffered all nations to walk in their own ways. Nevertheless He left not himself without witness, in that He did good, and gave us rain from heaven, and fruitful seasons, filling our hearts with food and gladness.