Romans 1:19-20 (AMPC)

¹⁹ For that which is known about God is evident to them and made plain in their inner consciousness, because God [Himself] has shown it to them.

²⁰ For ever since the creation of the world His invisible nature and attributes, that is, His eternal power and divinity, have been made intelligible and clearly discernible in and through the things that have been made (His handiworks). So [men] are without excuse [altogether without any defense or justification],