"The whole natural world is designed to be an interpreter of the things of God. To Adam and Eve in their Eden home, nature was full of the knowledge of God, teeming with divine instruction. To their attentive ears it was vocal with the voice of wisdom. Wisdom spoke to the eye and was received into the heart, for they communed with God in His created works. As soon as the holy pair transgressed the law of the Most High, the brightness from the face of God departed from the face of nature. Nature is now marred and defiled by sin. But God's object lessons are not obliterated; even now, rightly studied and interpreted, she speaks of her Creator.... CT 186.1"
"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:"
EGW's passage directly echoes the sentiment of Romans 1:20, emphasizing that the natural world is designed to reveal God. The connection is strong and meaningful.
"The most effective way to teach the heathen who know not God is through His works. In this way, far more readily than by any other method, they can be made to realize the difference between their idols, the works of their own hands, and the true God, the Maker of heaven and earth.... There is a simplicity and purity in these lessons direct from nature that makes of the highest value to others besides the heathen. The children and youth, all classes of students, need the lessons to be derived from this source. In itself the beauty of nature leads the soul away from sin and worldly attractions, and toward purity, peace, and God. CT 186.2"
"The heavens declare the glory of God; and the firmament sheweth his handywork."
Both passages highlight the idea that God's works (creation) reveal His glory and can be used to teach about Him. EGW expands on this by suggesting it's a particularly effective way to teach those unfamiliar with God.
"For this reason the cultivation of the soil is good work for children and youth. It brings them into direct contact with nature and nature's God. And that they may have this advantage, there should be, as far as possible, in connection with our schools, large flower gardens and extensive lands for cultivation. CT 186.3"
"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:"
While Romans 1:20 is a broader statement, EGW's passage applies the principle to the specific context of children and youth learning about God through cultivating the soil. The connection is present, though less direct than some other pairs.