When YHWH wants to teach mankind something, He follows a very specific method that I can copy in my homeschooling. First, YHWH clearly presents information. In this case, He used the things He had created, which can be seen by every person no matter where he lives, to make Himself plain to all people. The sun, moon, and stars are visible to all. The amazing capabilities of the human body are visible to all. The metamorphosis of a caterpillar into a butterfly… the water cycle… the fossil record — these are visible to all.