When you think of God, do not for one moment think physical. Physical has nothing to do with God. That is why no man has ever seen or known God except he who came out of the bosom of God, and that is Jesus Christ.
John said this about Jesus.
1Jn_3:2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
Based on your statements above, you do not seem to know God. (Maybe you know him by the stories told you by others about him; but you do not seem to have had a personal direct relationship with him through his word. This type of knowledge or understanding is revelatory, which really is spiritual in nature.
John 4:23 But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him.
John 4:24 God is a Spirit: and they that worship him must worship him in spirit and in truth.