I don't think you understand this religion. Devotion in this tradition is different than what is found in popular Western religion. It is not "faith" in a conventional sense. When the boundaries between subject and object have been erased, and there is no distinction between devotee and deity, what does "faith" mean?
Hmmm, are you suggesting that this religion differentiates itself from other religions on a logical basis? It seems to me that they just have different beliefs, different opinions which are made to pass as logic but which are in reality faith-based doctrine.
Admittedly, there does not have to be only one single interpretation of the divine that is true. Different paths could practice differently, hold different goals and seek different objectives for member self-development. Many can be right simultaneously.
However, when each maintains that it is the truest path by virtue of using logic to assert certain beliefs, certain 'absolute knowledge', then by definition only one can be the truest.
Logic, by its nature, is comparable and debatable. How well can the Aghori argue their views of Lord Bhairava, perfection, reincarnation, etc? How well can they persuade neighboring religions? Most importantly, if they do not possess the answers themselves then their logic is incomplete and they fill in the gaps with faith in their own personal visions.
And partial logic is logical as much as half a bridge can get cars over a river.
There are so many religions in the world. Do all religions see the same thing? Are all religions right? Is the world's religious ecosystem perfect? Could even one religion be wrong? Could two religions be mixed together to any degree and still retain integrity? Can new religions be invented or has it all been said and done countless times? Do humans know everything? Is a logically-perfect religion an end, bringing 100% conversion, or a beginning, offering countless possible sub-varieties of practice, of goals and ultimately of evolution into respectively different types of beings?
Right now, in my view, there's practically no evolution at all.