You are stating two things
One : Anger isn't actually something that is real
Two : God [...] is used to describe something different
These two things are not opposite to each other.
Anger is a description of something not a thing in itself.
God is (purportedly) a thing in itself, it is supposed to have created the universe then humans.
They are not linked concepts.
If you want to prove to me that anger and God are not real you should compare 2 comprable things.
I know that Anger exist because I feel it in my chest. Even if there are people out there who do not feel Anger in their chest.
Just like I know that God exist because I feel it in my chest.
I know what annoyance feels like, it is a rapidly beating heart.
How do you know that is is god that you feel in your chest. What does it feel like?
All humans are physiologically the same, if you can describe the feeling maybe someone here has felt the same or can tell you what your feeling actually is.