Yes, Gender is a spectrum and society should learn and respect there pronouns and recognize them.
No, Gender is not a spectrum and society does not need to bend to the gender fluid needs or will.
While I 100% believe that gender is a spectrum, I do not think society should be forced to learn new pronouns they way they learn "he" and "she"; however, society should be encouraged to educate themselves and to keep open minds.
Scientifically speaking, The brain reacts differently to different chemicals according to your gender. What we find is that people with gender fluid brains react differently than any other gender. And twin studies also support this. So there's no real reason not to "believe" in this.
This is a non-issue. Are we faced with this pronoun dilemma in our daily lives? Remembering them isn't required.
Science is the foundation of progress science also says there are only two genders and so do I.
your gender matches your genatalia
Definitely agreeing with everyone else on this side. The genitalia you are born with defines your gender, not your social beliefs. You have power over items you own, but not the structure of your body at birth.
No, even if gender is on a spectrum, the second part of the question is harmful to society. You cannot force people to believe or conform to something, because then that creates an overly obedient society, which could be (but highly unlikely) lead to something far more authoritarian. If you've ever read A Wrinkle in Time, you'll know exactly what I am talking about. Besides, gender is not a spectrum. Gender is based on the two biological sexes, and within those sexes there are individuals. Every single person is unique, and the need to use labels in order to prove that is ridiculous. Gender is not a personality, and gender dysphoria is a serious issue.