Though we can safely say that Jesus in human form was a man, this does not mean that God as a whole is entirely male.
When God made a part of himself incarnate as a human being, he had two genders to choose from: male or female. Since Jesus came to us in a time where women were not highly regarded in society, it made sense for him to be born a man. Let's face it; back then, nobody wanted to listen to a woman. Even if God had chosen to appear as a female, would this automatically make God a woman? No. But we would probably have made that assumption.
In order to give some definition to the relationship between us and God, we call God the Father. This creates a sense of understanding of God's parent-like love for us. We don't address our own parents as: "Parental Unit," we address them as "Father," or "Mother." There was simply no gender-neutral term available that carried that same sense of warmth as "mother," or "father."
So, Father it was.
And yet our God is not bound by the nature of this world. God is Alpha and Omega, the beginning and the end. God was here before this world. God was here before the first man and before the first woman, both of whom were created in God's image. God was here before anything physical.
God was here before gender.
How then can God be bound by our earthly standards of man or woman?
I do not mean to say that God is both man and woman, nor do I mean that God is entirely unlike either.
Instead, I believe that God is above gender.
God is love, and love is present in all of humanity, including women, so how can God be a man?
God is the Father and the Son, so how can God be a woman?
God is the Holy Spirit, so how can God be either?
Let us not try to bind God to the limitations of humans.