No way. I am sorry that cannot be true. The church excommunicates people for this the first time.
If you are speaking from a Catholic perspective, then there are two problems with what you're saying. First of all, Prager is not Catholic, so he was never "in-communicated" in the first place.
Secondly, simply keeping your marriage together doesn't make one "good". "No one is righteous; no not one." So your interpretation of HitmanNY's comment is devoid of practical meaning. Dennis Prager is "good" in the same sense that any other person is "good" apart from Christ; that is, not at all.
And yet, even so, we make judgements all the time, and I think we should, about how "good" someone is in the sense of the relative value of the deeds they do. And in that sense, I'd say Dennis Prager is on the positive side; even though again, he is in no less need of God's intervention than I.
Read up on Jewish law and divorce.
http://www.jewfaq.org/divorce.htm