List of reasons to believe God exists?

[Jehanne]

Another proof I have not presented is the existence proof.

That is existence is the default state. Non-existence is impossible. 

I would take it further and say any non-existence is impossible. This proves existence is maximal existence and absolute existence.

To say why any non-existence is impossible - is the same reason why non-existence by definition is impossible.

This is an argument in favor of atheistic naturalism, not theism. (See Grifiths proof above.)