Although the light of nature, and the works of creation and providence do so far manifest the goodness, wisdom, and power of God, as to leave men unexcusable; yet are they not sufficient to give that knowledge of God, and of his will, which is necessary unto salvation. --WCF I.1.It's true, of course. But for those of us who know Jesus, who know the secrets of the parables in Scripture* and the meaning of all the object lessons he put into creation, the truths of the natural world illuminate in deeper clarity the truths taught in Scripture.
*I allude here to Luke 8:10, "To you it has been given to know the secrets of the kingdom of God, but for others they are in parables, so that 'seeing they may not see, and hearing they may not understand.' "