Whether binary or a spectrum, innate or a construct, or soon to be irrelevant, gender is one of the most divisive questions on the world's lips. Are there more than two genders? What are the sides to the gender debate?
Yes, there are more than two genders
Gender expression is not exclusively male and female. There are many forms that reside on a spectrum. This spectrum offers tremendous freedom to transgender persons as well as to people born intersex.
Gender is a spectrum
Gender is not tied to biological sex, but rather is socially constructed and a form of personal expression.
Many societies have historically recognized more than two genders
Being nonbinary is not something new; there is great historical precedent for there being more than two genders. There have been many historic instances of people who are not male or female, so we should accept that there are more than two genders.
While it can be socially influenced, gender has been shown to be biologically compelled. Even when raised the opposite sex, an individual will still find the urge to behave in line with their born gender. Transition surgeries and therapies are meant to bridge gender incongruity, but result in higher suicidality.
The story of the bible explains God's design when mankind was born as there being only man and woman. The stories that follow explain too that those confused about their identity have a challenge to overcome in life, as all do. But it can be overcome.
Gender correlates with sex, and there are only two sexes
There are only two genders because there are only two sexes. Special cases, such as intersex people, are a rare exception to the biological male and female sexes. The existence of rare exceptions does not invalidate there generally being only two sexes.
Allowing more than two genders would require too many changes to our society
Most societies have traditionally recognized men and women as the two genders. Changing this system would require drastic changes. It would be impossible for every institution to catch up to all of the changes that would be necessary to allow more than two genders.
People who do not conform to their gender roles are not a different gender
There are masculine women and feminine men. Just because these people do not embody their assigned gender role, that doesn't mean that they are not their assigned gender. People like masculine women and feminine men are not a third gender.