For His invisible attributes, that is, His eternal power and divine nature, have been clearly seen since the creation of the world, being understood through what He has made. As a result, people are without excuse.

Now the practice of circumcision [i.e., the Jewish rite of identity, signifying the responsibility to observe the law of Moses] is worthwhile, providing you obey [the rest of] the law of Moses. But if you disobey the law, you might as well have never been circumcised.

And as Isaiah said before, "Except the Lord of hosts had left us seed, we had been made as Sodom, and had been likened to Gomorrah."