But taking the scriptures into account, basic logic, God as defined (even by dictionaries),
God can only be one being...
...It's not a personal belief.
There can only be one God, by definition.
There are lots of different deities in religious history. Tradition provides us with countless names and no end of divine attributes.
When we start talking about "first causes", we're talking about the more abstract and cerebral 'God of the philosophers'.
Equating at least some of the deities of religious tradition with the philosophical functions that embody the 'God of the philosophers' is a conceptual leap that requires some justification.
We also need to be cognizant that the classic Aquinas-style God of the philosophers was intentionally conceived in such a way as to hopefully be consistent with the tradionally understood God of medieval Christianity.
There cannot be two first causes, neither can there be two Supreme Beings.
Do can you deny that?
Maybe different aspects of being have different "first causes". In other words, maybe the multiplicity of chains of physical causation in the universe don't all have one single origin.
Maybe the "first cause" isn't identical with the "ground of being". In other words, maybe whatever the explanation is for why there's something rather than nothing isn't identical to the explanation of what supposedly kick-started time and change into motion.
We've already seen that the explanation for a great deal of the functional structure that we observe in nature might be attributable to yet another very different kind of explanation. That's why many religious believers can't forgive Darwin for proposing natural-selection and in so doing subverting the traditional design argument.
Nor do we really know that everything in the universe has the same teleological goal. Or that there's only a single savior. (Assuming that teleological goals and saviors even exist.)
''God'' was always meant to be a function, even from the Christian era.
Some of the Christian Neoplatonists did conceive of the emanations proceeding from out of the incomprehensible Godhead in that way, as functional 'energies'.
But historically, the Christian God, like just about all the other deities of religious tradition, was conceived first-and-foremost as a "person", a heavenly Somebody that humans can relate to emotionally in much the same manner that we relate to other human beings.
That's very different thing, both conceptually and psychologically, than an abstract philosophical function.
It needn't be on faith. We can analyse what ''God'' is, just from the basic definition.
But where does a "basic definition" come from? Is there really some secret body of language controllers out there that establishes the one-true-definition of words?
It's probably more accurate to say that words have
uses. Lots of people use a particular word, in different times, places and circumstances, and they aren't always using the word to express exactly the same idea. Often words have a range of meanings that might not even be entirely consistent. So it's often helpful to study the history of words and to try to determine the historical influences that have shaped the various usages.
I think that the word 'God' is like that. That's really all that I've been trying to say.