This point is often missed by evangelical feminists. They conclude that a difference in function necessarily involves a difference in essence; i.e., if men are in authority over women, then women must be inferior. The relationship between Christ and the Father shows us that this reasoning is flawed. One can possess a different function and still be equal in essence and worth. Women are equal to men in essence and in being; there is no ontological distinction, and yet they have a different function or role in church and home. Such differences do not logically imply inequality or inferiority, just as Christ’s subjection to the Father does not imply His inferiority.
John Piper, Recovering Biblical Manhood & Womanhood
feminism, gender-equality