There is "No Excuse" (Romans 1:19-20) for anyone not to believe in
God or to trust in the Lord Jesus Christ as Saviour. God has revealed
Himself so clearly, even in our fallen world, that someone has to
willfully reject Him to not become a Christian. Psalm 19 tells us of
four books or self-revelation of a personal God whose name is Jesus.
C.S. Lewis calls Psalm 19 "the most beautiful poem in the Psalter."