What Is God Made Of?
People have often wondered, what is God made of? Is He made of flesh and blood like ourselves? Certainly not. What then is the material that forms His being? Is God made of matter at all? Or is God pure energy? Or is He in some sense pure thought?
The answer of Scripture is that God is none of these. Rather, we read that 'God is Spirit' (John 4:24). This statement is spoken by Jesus in the context of a discussion with the woman at the well in Samaria. The discussion is about the location where people should worship God, and Jesus is telling her that true worship of God does not require that one be present either in Jerusalem or in Samaria (John 4:21), for true worship has to do not with the physical location but in one’s inner spiritual condition. This is because 'God is Spirit' and this apparently signifies that God is in no way limited to a spatial location. We should therefore not think of God as having size or dimension, even infinite ones.
Taken from Bible Doctrine p.86