Is there a standard Christian ontology? I have asked earlier how Christians understand God in relation to the scientific concept of energy.  Ultimately that line of questioning was stopped by the observation that my ontology was very different from the likely respondents.  While I addressed the issue of ontology in the physics stack exchange (and consequently had the question moved to the philosophy stack exchange), there seemed to be very little interest and even less consensus on a coherent and widely accepted ontology.  This got me wondering,

Is there a widely (or historically) accepted Christian ontology?



FYI: My personal definition of "existence" would run something like "that property which, when possessed by a well defined object, allows for causal interaction with other well defined objects that share the property of existence."
St. Augustine of Hippo was influenced, and in many ways owed his conversion, to the writings of the neo-platonists. 

Most Christians would accept him as the most prolific Christian philosopher of the first millennium; St. Thomas Aquinas, as his successor in the next millennium, reintroduced his wisdom in the form of the Summa Theologica; wherein you will find all your answers.



Catholic encyclopedia also has a good treatment on Existence. 



In my own words, I'd say that Catholic philosophy defines existence, as we know it, as God's creation. God, on the other hand, is the prime mover.  Existence does not signify matter or energy, as Angels exist and the immortal soul exists yet are not observable.  And God's existence, as a pure spirit, cannot be defined my the human intellect.