If God exists he is a necessary being because it is logically impossible to be by chance. Because the universe would be a creation of God, the universe is by chance. It is a coincidence as it exists the way it is now because the conditions and devices existed. These devices existed by chance therefore making it a coincidence that the universe is the way it is now.
I think your syntax is off, because this is a bit difficult to sort out.
Either way, it's clear you're talking about chance and randomness in regards to our universe. I don't see it as necessarily coincidental that things are the way they are.
If you roll a six-sided die, it is certainly possible to land on a 1 over any of the other sides. To find that amazing, or so coincidental as to be miraculous? Well, if that's how one feels, then by all means. I can't say I find it very much surprising at all, that our universe landed on a 1 (or whatever other number) as opposed to some other. The dice was rolled***, and now we're here. Cue the confetti.
Within our space and time, we see that things are not coincidental. Not entirely, anyway Things occur as per forces and principles, molded by whatever prior conditions are in place at the time. The extent to which these forces constrain what outcomes can occur is a discussion for some other thread (e.g. free-will and determinism).
Not sure why we would suppose the inception of our space-time is exempt from these principles of probability, causation, conditions, and so forth -- let alone why God, or at least a "necessary being", is the only and/or most probable explanation
***But whom rolled the dice, Sehnsucht? To which I say that question misses the point of the analogy. It's about probability and outcome.
The existence of one being is necessary to the existence of another, but one being must always exist and cause the existence of other entities. That paragraph was explaining why the necessary entity exists, since without the necessary entity nothing would exist because nothing can come from nothing.
We can all agree that there is bound to be some fundamental principle that grounds everything, be it our single universe or a multiverse or an infinity of realities or whatever else. An ontological bedrock. Something uncaused, but from which all things are ultimately caused.
If you want to call this bedrock "God", by all means. You can call it whatever you want. I'll call it "Jambalaya." One name is as good as any other for this "necessary principle".
But if by "God", you furthermore mean an actual
being or
person, then there's something to be discussed. We can have a necessary
principle, but why does it have to be a necessary
being? Why suppose such a thing has properties of agency, intent, self-awareness, and/or other qualities associated with being and personhood? How does one jump from "That Which Grounds" to "He/She/It That Grounds"?
The supposition that Jambalaya needs to be a person is what always bugged me regarding the Cosmological Argument (and other variants thereof; your own argument above is a variant of these kinds of apologetic argumentation). I can't recall if I've ever encountered a presentation of these arguments in which the presenter justified why this "Prime Mover" is a
being instead of something else.
What further befuddles, of course, is when not only is it proposed this necessary thingamajig is a being, but that we should worship/venerate/etc. this being, or that this being
wants those things of us. Is this something you would propose, or that you yourself believe?