That is a toughy. Many will disagree with my view. And, I don't want persons to assert falsely my spiritual system from this answer. Looking loosely at Genesis 1:26-28 we discover this is the only passage in Genesis 1 where sexuality is referred to. Again, loosely, verse 27 points out poetically
So God created man in his own image,
in the image of God he created him;
male and female he created them.
I see 'man' is created in God's image. However, I see man as being the spiritual duality of both male and female. Man cannot exist without one or the other. So, for me, right or wrong, remembering the difference between right and wrong is what is left, 'man' is male-female. If we are in God's image then God is spiritually that as well.
I think the father is a result of the sociological pattern of a patriarchal influence. Though, the male is pointed out as being the headship it is also pointed out the male is not dominant - equality exists with male and female as 'man.'
But, that does not answer your question, "what is God?" It only offers a means of relating to God, before the work of Christ. And that work offers healing for the separation occurring after the verse mentioned earlier.
This is way too long. What is God - for me God is a concept. Who God is may be a different story entirely.