The highest teaching of Shiva Sutras that is encouraged by the ancient teachers to begin first and if you can not cope with it go to lower ones is
Śāmbhavopāya. The first sutra is "Caitanyamātmā" meaning "The essence of the self is pure consciousness". The second sutra "Jñānaṁ bandhaḥ" is "Conceptual knowledge is the bondage to realize this".
This high-level teaching tells that you are God but uses different names for it thru out the scriptures aiming for you not clinging on a name which is also a concept. Shiva, Anuttara, Hrdaye, Bhairava just examples.
God is nothing in the sense of no-thing. It is not a thing. Neither a material substance nor an intellectual concept...