I have always thought of God as being a spiritual being, though I suppose he could have form.
a. Spirit-->God is spirit, and those who worship Him must worship in spirit and truth."
b. Light--->This is the message we have heard from Him and announce to you, that God is Light, and in Him there is no darkness at all.
c. Love-->The one who does not love does not know God, for God is love.
d. A consuming fire-->Therefore, since we receive a kingdom which cannot be shaken, let us show gratitude, by which we may offer to God an acceptable service with reverence and awe; for our God is a consuming fire.