How great is God?
No one really knows. Or else. The greatness of our Lord cannot be comprehended by any human being mindA computer with the greatest computing power is not able to count it. To put it more figuratively: the Divine essence goes beyond any framework that we could impose.
God is the being who created everything. He is therefore greater than anything that was created by Him. Greater than anything that has existed so far and that will come into being in the future. Quoting the words of the song: How great is God? He has time in His hand. He lasts forever and ever. He is the beginning and the end.
At the same time, each of us will perceive God and its size a little differently, because it is everything we can imagine but at the same time it is something much, much bigger. To this topic (as to most topics concerning God) should be approached quite individually.
I refer those interested to the song that was mentioned earlier. The song is entitled "How Great Is God?" and is a song of praise to our Lord.