"he created them; male and female" - God's nature contains both; changing gender is merely a case of emphasising one aspect of God's image over another
Paul's letter to Galatians: "you are all one in Christ Jesus" - gender identity has no importance
God created man as a whole - man was given the responsibility of choice about how to live their life
Jesus: "every woman who makes herself male will enter the kingdom of heaven" (from early text Gospel of Thomas) - however, opposes gender equality