I would say apophatic theology does a fairly good job of demolishing fanciful definitions of God upon which some religions base their teachings.

http://en.wikipedia.org/wiki/Apophatic_theology#Apophatic_description_of_God

> Negative theology has a place in the Western Christian tradition as
> well, although it is definitely much more of a counter-current to the
> prevailing positive or cataphatic traditions central to Western
> Christianity. For example, theologians like Meister Eckhart and St.
> John of the Cross (San Juan de la Cruz), mentioned above, exemplify
> some aspects of or tendencies towards the apophatic tradition in the
> West. The medieval work, The Cloud of Unknowing and St. John's Dark
> Night of the Soul are particularly well known in the West.

There is also some similarity with this in Buddhism, in the [Diamond Sutra](https://en.wikipedia.org/wiki/Diamond_Sutra):

> After these words, the venerable Subhûti spoke thus to Bhagavat: 'O
> Bhagavat, how is this treatise of the Law called, and how can I learn
> it?' After this, Bhagavat spoke thus to the venerable Subhûti: 'This
> treatise of the Law, O Subhûti, is called the Pragñâ-pâramitâ
> (Transcendent wisdom), and you should learn it by that name. And why?
> Because, O Subhûti, what was preached by the Tathâgata as the
> Pragñâ-pâramitâ, that was preached by the Tathâgata as no-Pâramitâ.
> Therefore it is called the Pragñâ-pâramitâ.
> 
> 'Then, what do you think, O Subhûti, is there anything (dharma) that
> was preached by the Tathâgata?' Subhûti said: 'Not indeed, O Bhagvat,
> there is not anything that was preached by the Tathâgata.'

source: http://www.sacred-texts.com/bud/sbe49/sbe4929.htm