Well the good news is that "they" is no gender identity I've ever heard of. It's the third-person pronoun to be used when gender either doesn't matter or is unknown. For example, "I got an email from a new client, I wonder what they want?"
Anyway, I guess what I'm saying is that pronouns themselves aren't genders. You should list whichever pronouns you're comfortable being used for yourself, and the presence or absence of them from your profile says nothing about your personal beliefs.