I am a theist, what do you think of my proof for God existing?

[Asmodee]

"The default status of things in the totality of reality is existence."

Do you anyone atheist here concur with me on that statement?

If not, what is your alternative?

And please, I will not take this standard answer from atheists, “We don’t know.”

First, that statement, like much of what you say, has no meaning.  I think you mean "default state", not "default status", but even with that change that statement just makes no sense.  What is "the totality of reality"?  Do you mean "physical reality" only?  Do we include my thoughts in the "totality of reality"?  If so, when you say those thoughts "exist" do you mean they exist as thoughts or do you mean the subject of those thoughts exist?  For instance, if I think of a dragon and we say "the default state is existence", does that mean my thoughts on the dragon exists or the dragon itself?  It SOUNDS like you are trying to assert that "real things are real" which, while accurate, is kind of a stupid thing to feel one has to assert.

Second, I don't have to give an alternative.  The universe is not black and white.  We cannot accurately label or define anything and everything just because we would very much like to.  If you tell me that you saw a dragon and I don't believe you I do not have to give you alternatives for what you actually might have seen for it to not have been a dragon.  Not being there I likely don't know what it is you saw, but I can STILL be pretty certain it was not a dragon, even without giving an "alternative" for what it might have been.  And, in fact, it has been my experience that the reason for asking for an "alternative" explanation is just so that you have something to argue against to distract the conversation away from the holes in one's own argument.

Third, "I don't know" IS ALWAYS a valid answer.  Anyone pretending to have an answer for everything is too ignorant to understand what they don't know.  To say that you will not take, "We don't know" as an answer is to say that we must make something up if we don't know.  That is a ridiculous request.  If I don't know something I'm not going to simply make something up and call it true.  That's what theists do.