God is spirit. God is light. God is love. Those are some of His many attributes. No one of those words fully describes Him. In the Clementine Homilies, a Jewish Christian document based on a second-century source, the Apostle Peter is speaking to a non-believer by the name of Simon. Simon wants to know if Peter actually believes that God has a human form and that mankind was literally created in His image. Here's how their conversation goes:
And Simon said: "I should like to know, Peter, if you really believe that the shape of man has been molded after the shape of God."
And Peter said: "I am really quite certain, Simon, that this is the case... It is the shape of the just God. For He has shape, and He has every limb primarily and solely for beauty's sake, and not for use. For He has not eyes that He may see with them; for He sees on every side, since He is incomparably more brilliant in His body than the visual spirit which is in us, and He is more splendid than everything, so that in comparison with Him the light of the sun may be reckoned as darkness. Nor has He ears that He may hear; for He hears, perceives, moves, energizes, acts on every side. But He has the most beautiful shape on account of man, that the pure in heart, may be able to see Him, that they may rejoice because they suffered. For He molded man in His own shape as in the greatest seal, in order that he may be the ruler and lord of all, and that all may be subject to him."
Besides, the Greek word "pneuma" which is sometimes translated as "spirit" in the Bible, is translated as "life" elsewhere in the Bible. So, God is "pneuma" could also accurately be said to mean that God is life. That's how I see God -- as the very essence of life.