The question "How big is God?" may sound, at first, like a childish question. And it is a question that children tend to ask. But it is also a question that philosophers deal with while trying to grasp the existence and nature of God. The fact is, God transcends physical dimension. It is not possible to define Him by human standards of size and measurement. This is the God who created the universe, and the atom, and everything we see and feel and experience. God created the concept and reality of infinity, and therefore He must be "outside" of infinity, both in terms of time and space. It is fruitless to try to figure out the answer to the question "How big is God?" because God's size cannot be determined or even expressed by the human mind.
How big is God?
God is not made of matter, and does not have a physical form like ours. That is why He came to us as Jesus Christ—God "incarnate" or in the body—so that He could relate to us on our level (Matthew 1:23; Hebrews 2:11, 17; 4:15). But God is "spirit" (John 4:24) and is essentially different from man (Isaiah 55:9). We are a soul, connected to a body, and we exist within the limits of space and time. We walk on a line from birth to death, and we are constricted by the dimensions of our bodies. However, God is eternal (Deuteronomy 33:27), and is not constricted by anything. In heaven, there is no temple, because "its temple is the Lord God the Almighty and the Lamb" (Revelation 21:22). He is able to see all the people on the earth at one time (Psalm 33:13–14) and is therefore not constricted by space. He is simply outside of those things.
Even though this is true, God communicates with us (Isaiah 40:8; Matthew 4:4), listens to our prayers (1 Peter 3:12), and loves us (John 3:16). In fact, though He is infinite, He subjected Himself to a linear time frame and a limited human body in order to deliver us from the death that was our due because of sin (Romans 5:6–9). Imagine what the incarnation must have been like for Jesus—probably something like you or I becoming a two-dimensional being or an insect. This proves that God's love, just like everything else about Him, is too big to measure.
"For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord" (Romans 8:38–39).
The attributes of God, what are they?
Is God omnipresent? What does it mean to be omnipresent?
Is God immanent? What is significance of the immanence of God?
What does transcendent mean? How is God transcendent?
How is God infinite? What does it mean that God is infinite?
Truth about God