Thoughts can be measured and therefore are definitely things. Anything that can be thought can be measured as such. Anything that manifests due to thought can be considered a thing as well. A thought form is a thing.
You are certainly correct when you say GOD (not GODS because GODS are all a form of the ONE) is not physical since GOD is beyond the physical. But when we conceptualize GOD we are bringing the idea of God into the physical with our thoughts.