father and the son together

In the New Testament John 3:16 is often thought of as the central verse in the Bible. However, the most important verse in the Old Testament, and the most significant verse in all the Torah is 
Exodus 3:14. 

It says that God is Existence. Specifically I am that I am means existence. The word Hayah is the first person singular meaning existence. This is the report of Moses, credited with being the first to write anything Biblical down. Moses himself does not give this definition, God is answering Moses about who He is. This is God describing Himself.

Yet if you look it up in your hand held you will not find any definition like this until you dig deeper. God is a supreme being seems to be the consensus. All of the definitions come from other people, not one single one quotes Moses' report that God said He was I Am that I Am, meaning existence.

God did not say He created existence, He said he WAS existence. He did not even say he was a supreme being, probably caused by the obvious fact that, in these definitions by men, even idols could bee supreme beings. 

He did not say He was in control, This definition by men is subconsciously created to shift all responsibility for everything off the shoulder's of men and onto God. This requires no belief on our part, for instance God will heal us if we can only persuade Him to do so. No admission of belief is required from us. This despite Jesus said over and over again, if you believe, be it done to you according to your belief. We are not healed by the belief of Jesus, but by our belief in His power. Many believe in Jesus but not His power. I call this view Christian atheism.

So if the atheist does not believe in God he does not believe in existence.