Spirituality, is experiential and has more to do with development and discovery of the self. ....

 Ontology is the inquiry into what "is", what exists. Metaphysics is the study of what "is" outside of the physical world - Ideas (in the Platonic sense), Forms (in the Aristotelian sense) and theological concepts such as souls, angels and gods.

The claim that there is a God raises metaphysical questions about the nature of reality and existence. 

Derived from the Greek meta ta physika ("after the things of nature"); referring to an idea, doctrine, or posited reality outside of human sense perception. As such, it is concerned with explaining the features of reality that exist beyond the physical world and our immediate senses.

Metaphysics is philosophical: it's about explaining the fundamental nature of the world and what it means as humans to inhabit it. 

Spirituality, on the other hand, is experiential, and has more to do with spiritual practices and the development and discovery of the self. ....