To belong to mankind is to be male or female (Gen. 1:27). No one is an androgynous being. Every human will forever exists as a man or a woman. Binary sexuality is an essential part of God’s perfect and enduring design.
This is first demonstrated in the fact that the Messiah (the seed) will be a descendant of Eve (Gen. 3:15). However, it is also demonstrate by the great emphasis that Scripture places on genealogies. God will bring the Redeemer into the world through mankind’s obedience to the creation mandate (i.e. be fruitful & multiply). This emphasis reaches its climax in Matthew 1:1-17 and Luke 3:23-38.