The signature of the Gra on the letter of excommunication is generally ignored and because of that the Dark Side has taken over most of the religious world. [There are exceptions like the great Litvak yeshivas that are devoted to straight Torah, -- but outside of them I fear the religious world is dark and ugly-- and highly immoral.]
[The problem is that if you look at Kelley Ross's Kant Fries school you will see there is a hierarchy of areas of value.
From that I think it is possible to see that the major test of a person is to separate the good from the evil in whatever area of value his or her abilities lie in.] So the test of the religions area of value is if one is willing to accept the insight of the Gra. The signature of the Gra is what separates good from evil. But it is not an area that is impossible to discern. Rather--reason can discern where is the truth. All one needs is a bit of common sense. I.e. reason has the ability to discern between good and evil. [As Huemer goes into in his paper on Ayn Rand.]