Sunsets inspire art. They are not the art itself. The woman that sat for Leonardo was not a work of art, even though she inspired Leonardo to paint the Mona Lisa.
The God thing is a can of worms that I am reluctant to address. However, the belief in God is another example of what I am talking about. That belief has inspired incredible works of art.
Believing that God is some sort of Meta-artist, I think, is ridiculous. Art is made by humans for humans. God is not a prerequisite.
In order to begin an art class I tell my students that in order for something to be considered a work of art there are three criteria that must be met.
1. The work must be created by someone who is intending to create a work of art.
2. Something tangible must be produced.
3. The work must be presented to an audience.
Do you agree with my definition or are there other criteria that you would mention?