Are 'God', 'souls', etc... being referred to as 'Idols' here? It wasn't clear if that was the case or if the statement was separate and referred to regular idols.
If it's the former then the religion is unclear to many of its followers that the assertions they hold as truth are place holders of speculation.
Sorry I should have used symbols instead of idols. We're talking (or at least I am) about religious expressions of theism and how they are representations of an underlying belief in the concept of a universal consciousness (which is the basis for Eastern spiritual knowledge, the topic of the OP)