giving vengeance to those who don't know God, and to those who don't obey the Gospel of our Lord Jesus,
As Moffatt declared, "The repetition of the article here"[21] indicates two classes of people: (1) those who do not know God, and (2) those who obey not the gospel.  These are usually explained as "the pagans" and "the unbelieving Jews."  Implicit, however, in the adverse judgment to be pronounced against them that "know not God," is the fact of their "refusing to know God"  (Romans 1:20-28) and of their being in no sense innocent, but "without excuse."  In the second class, it is ridiculous to limit this to "unbelieving Jews."  It refers with equal power to "unbelievers" of all races and nations, even professing Christians, who refuse to "obey the gospel."  And what does that mean?  It means those who refuse to be baptized into Christ and to assume the duties and obligations incumbent upon all true Christians.  The most concise and the shortest definition of the "gospel" in the New Testament is in  Mark 16:15,16, where Christ equated being baptized with the "gospel."  Here is the prime reason why people have labored early and late to get that verse out of the New Testament. Some of the commentators reflect the usual unwillingness to allow this obvious truth, a sample of which is (comment on who obey not the gospel):