The leaders of the religious world tend to come under the category of Torah scholars that are demons that Rav Nahman brings in the LeM in ch 12. [ch.s 28, 61, vol II ch.s 1, 8 and many other places that do not occur to me this minute ] There are exceptions but no fixed rule how to tell. Someone suggested to me that this is the reason so many do not show much interest in keeping the Torah since the Torah scholars that are demons give the Torah a disreputable reputation. 

In the LeM of Rav Nahman you do not really see any clear way of how to avoid the demonic Torah scholars except in the LeM ch 12 where the major difference is the "Shelo Lishma" aspect. [i,e, those that use Torah to gain power and money.]   

In any case you see Rav Nahman was very aware of the problem that the Sitra Achra has taken over much of the religious world. No wonder most people left it when they had the chance. 

So in a practical sense how does one come to learn authentic Torah? To me it seem the answer is clear--to go to any yeshiva based on the Gra. However in that very conversation it came up that many people in Israel have had problems  even in Litvak yeshivas. So while I base my recommendation of Litvak yeshivas based on my experiences in Litvak yeshiva in NY, it could be that in Israel things might be different. So maybe the best thing is to learn at home? 

[The Rambam brings the problem of using Torah to make money in his commentary of Pirkei Avot ch 4 on the Mishna "He that uses the crown passes away". [To find that commentary you have to go to chapter 4, because the same mishna of Hillel occurs in chapter 1 and there the Rambam does not write anything.] ]