Why do you say it is nonsensical? I did not say God is everything, I said everything is within God. A tree is not a forest...
If you imagine a container without any boundaries or limits, not constrained by the limits of time and space that contains the unlimited universe within it...and this is but a fraction of the personality of God...then you might get an inkling..
Every thing does not have the identify of God. A human being has a self aware identity. A human being has two arms, but the two arms if separated from the human being do not have a self aware identity. They are just parts of a whole human being removed from a human being. They could be attached to a different human being. If you lost both your arms and legs, you would still be you. You might feel less than you were because of the loss, but you would forever remain you. You could not be removed and attached to another human being. God is the container of all things, but God is not a thing. Things are not God.