He goes old-school by entering into the ritual of walking between animal parts. Animals were split in two and the two covenantal parties walked through the parts to say that if they didn’t honor the covenant, they would suffer the same fate as the animals and be torn apart. God walks through the parts! The “smoking fire pot” (make sure I get that right…and not “smoking pot”) and “flaming torch” passed through the animal parts; these symbolize God. Even though He is God, He is willing to be torn apart if He doesn’t keep his promises.
If we still struggle to believe that God will keep His promises to us, we can look at a Crucifix. He is so committed to us that he sent His Son. And, he established a New Covenant with us. When we come to Mass, we hear the words at the Consecration: “this is my blood…the blood of the new and everlasting covenant”. God keep his promises and fulfills them in Christ.