Who did Israel reduce the Creator of everything down to being like?
Israel reduced the Creator of everything to nothing more than someone like one of the other gods of the planet. Despite His being the Creator of everything that has ever been created, they treated Him as merely comparable to the other gods of the planet, a reduction the context calls past understanding.
Les explains that the Creator of everything that has ever been created was reduced by Israel to nothing more than someone like one of the other gods of the planet. He notes that this is past understanding, yet they were doing it every day. This is the one Paul refers to as having come out of all the things Israel had enjoyed, including the covenants given to the patriarchs, though the context goes further back to Genesis chapter 3. After Adam and Eve ate the forbidden fruit and fell, God immediately promised a Redeemer in Genesis 3:15.
Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;