Melvil Dewey was right in classifying all religions together, even though some worshippers are certain there could be nothing further apart.
Religious beliefs should actually be compressed even further together - into a singularity - for it is all one - and as unknowable as a black hole.
Whether the origins of a religion are based on truth, invention or misunderstanding makes no difference.
The similarities in the nature of belief and the approach to the divine are significant enough for us to identify a universal religious state or emotion.
Perhaps that actually means that the adored object, the creator, the superior being, is in reality the same for all religions, only differing in the detail. There's only one problem: the devil is in the detail.