The Triune God IS one God.
Sounds like you are fighting a strawman of your very own creation.
I bet that you can't even tell us what you think The Trinity even is.....
According to James White, whom members of this thread confirm has a "correct understanding" the Trinity is simply a group of individuals of the same God-species. Just like we may have 1,000,000 dog individuals of one dog kind, and we would say "Hear O Israel, Fido is One Dog" and we would refer to all dogs as "Fido." James White didn't use "dog" as the example, but he actually used "cat" and "rock" as examples.
Never have heard anyone explain how this differs from polytheism. Can anyone deal with this elephant in the room, or is it preferable to continue to tear at each other and accuse each other of being demon possessed, needing to repent, not interested in truth, etc?