You do if you wish to communicate accurately with a diverse range of cultures and peoples. There are so many god-concepts out there that the extra clarity can be important. Not just in of itself, but because it shows respectfulness for that diversity.
It's unfortunate you interpret it that way, because it's missing the point entirely. It's about recognizing that the labels "theist" and "atheist" are vacuous, and that god-concepts are very diverse. It's simply a fact that if we take all the god-concepts throughout human history and throughout various cultures, you end up with everything as god(s). It's not intended as a snide backhand, it's a testimony to diversity. And it's a prompt to ensure that we more precisely clarify what we believe and practice to others. When you say "theist," what god-concepts or attributes are you honoring in your life? When you say "atheist" what god-concepts or attributes are you rejecting from your life? Be specific.
I don't feel it is unfortunate in the least. What I do feel is that humanity doesn't need god concepts at all. They are unnecessary. Air to breathe is necessary. Food to eat - necessary. Water to drink - necessary. Sleep - necessary. God concepts? To label them "necessary" is, in my opinion "missing the point entirely" as you put it.
The benefit people receive from religion is entirely personal, and can only be shared anecdotally and certainly not with the same efficacy. Nor does "a religion" match to the "need" that all people feel for this "spiritual something". Air to breathe is effective regardless the person doing the breathing. Water? The same. Food? The same (barring allergens, etc. obviously). Sleep? The same. Religion is a divider. From what I (and many others) have seen and experienced, it takes a certain type of mind to simply accept another's religious views when shared without making judgments or comparing and coming to some notion of what the other is "doing wrong." Hell... those types of judgments happen (and are going to happen)
anyway! Does anyone think it is a good idea to lump religion into that mix and give some people what they are bound to feel is
divine support for their opinions?! Also - any given religion is not necessary to the survival of anyone else who doesn't have knowledge of it, or chooses not to believe it, or chooses to believe something else entirely. And there are plenty of people (myself included) who live without any religious practice or belief whatsoever. Saying religion is necessary for survival would be akin to saying that everyone having a favorite book is a necessity for survival.
As a last statement here, just think about your above statement in this light - when
"everything is a god"... I feel it makes the idea of "god" less meaningful and renders it unimportant. Kind of like attributing everything the term "special." When everything is special, then "special" is the new "normal," "mediocre," and even "bad."