Event Horizon.

Somewhere inside the Cosmic Microwave Background, is a boundary.
This is the Event Horizon.
The point beyond which nothing that may happen has any relevance to an observer.
So far off, that whatever might happen, an observer will never know about it.

It is not a physical boundary. But it might as well be.
The truly unknown...

Each of us has our very own Event Horizon.
It surrounds the limits of our awareness.
Some may inhabit a bubble barely larger than themselves.
While others may inhabit a limitless space.

Thus to attempt to define, or understand God, is a pointless excercise.
One may give a pretty description, but it can never be any more than that.
No description will be comprehensible to everyone. Or even anyone.

In taoism, there exists the concept of tao.
Tao being the container of all that is. As well as all that is not.
The all and everything. The eternal.
That which existed before anything existed.
The source.

Some refer to this as the Big Bang.
Some refer to this as God.
Some refer to this as tao.

The detectable indication of its existence is the Cosmic Microwave Background.