Those are liberal arguments, saying 'groups' have opinions block opinions as opposed to dealing with people on an individual level.
Freedom of choice, to say it or not say it is individual.
There are many who are not monotheistic, many who believe in a female deity, and many who believe in no diety at all. Those two little words in the pledge are unwarranted.
Well, we can also throw out the parts of one nation, indivisible as well since it was only added in the 20's and is no doubt an afront to 'multi-culturalism'
Eventually someone or another would have taken issue with the whole thing. Just as people have taken issue with American flags in schools.
Its just divisive identity politics and should be called for what it is.