If the belief in the existence of something without proof doesn't logically translate into the belief of anything without proof; with what criteria are you drawing the distinction?
You believe in the existence of God without proof, why then would you fail to believe in the existence o anything else without proof?
That there exists these fleeting material forms that interact with each other in what we feel comfortable calling in aggregate, "universe" might be an indication that an absolute being exists upon which it all rests, which is why I'd be quicker to lean more toward cosmological arguments than teleological ones. However, this is still a consideration of God that is supported by something illusory in comparison. If, somehow or other, the whole universe ceased being manifest, yet the individual consciousness that you are remained in some unmanifest form, that cosmological argument would no longer suffice. Therefore the perfect basis for understanding God is on the eternal platform, rather than the transient material one.
The bottom line is that there are certain axioms that theists or transcendentalists accept and there are certain axioms that physicalists accept. We're each running off of different starting points, so it is difficult to really talk to each other. I'd argue that, for the strong theist or transcendentalist, self-knowledge is first knowledge. Whereas the physicalist's first knowledge pertains to the material world around him or her. The theist is more meditative and introspective, and the physicalist (which tends to be atheist) looks at the external world before considering what is self. And so the physicalists theorize that self is nothing more than a product of some material arrangement, and furthermore, since they don't feel there is a distinct self or soul that animates the individual body, they similarly feel no need to consider a superself or supersoul that is overall responsible for animating or maintaining the totality we call universe.
And if you do believe that is possible for all of the Gods listed to exist simultaneously, how could you have decided without any type of evidence which God was our creator and which God to worship?
If someone comes up to me and tells me that it is prophesied in their holy book that an evil gnome will descend upon the earth and cause its destruction, my response is one of nonchalance. It is not that I necessarily disbelieve this person. It is just that it doesn't matter to me since it doesn't pertain to that understanding of God I attempted to delineate above. If, on the other hand, someone comes and tell me that their holy book prophecies the coming of the flying spaghetti monster and they attribute this being with the qualities of God - i.e. eternally full in power, wisdom, etc. - then they are really just talking about God. Whether or not I am particularly convinced that God appears in the form of a monster made of spaghetti that flies isn't important. We're still referring to the same entity. So if someone presents a deity to me that is purported as having the qualities of a supreme God, then I make no distinction. If Zeus in fact holds these qualities, then for all purposes, "Zeus" refers to God. On the other hand, if the so-called deity fails in some way to hold these qualifications, then his or her existence is insignificant to me. That is how I view it. This is how I draw a distinction. So my answer is, let them all exist. Life goes on as usual.