I don't really understand this. I don't think of it as arbitrary; if we can have harmony between male and female individuals, why not a God and Goddess? I do believe it all reduces to a neutral force. But then the force wouldn't be a being, and so would have no purpose for creation or relationship.
Ok, to be clearer. My thoughts were
1.) How do you separate perfection into male and female versions of perfection? Where would things like wisdom, justice, compassion, perseverance (pretty much every trait actually) fall. There's is nothing distinctly masculine or feminine in them to create meaningful separation. Especially qualities like goodness, how would you separate goodness between male/female.
Also, since God in supposed to be wholly perfect and separation would make the resulting forces not a perfect God, but a relation of two imperfect beings. He can't split himself and retain his nature. Basically I feel like it points back to adam and eve. The complimenting attributes of men and women highlighting the non-division and wholeness of Gods qualities.
2.) There is the idea of the Trinity. A three part relation God to himself. Each member has different attributes, but they are still all perfect so they don't provide any contrast "goodness" wise if they are all in a vacuum together.
3.) As to the idea that a force doesn't need a relationship because it is not a being: My understanding is that God did not create us to keep him company for his benefit. He created us for the benefit of the universe to experience him. Sounds egotistical BUT! remember that if God is not a being then it's not about someone asking you to worship their personality its about asking you to worship everything that is good (which happens to be them). Mercy, Kindness, Justice, goodness, charity, joy, love and existence itself all wrapped into the idea of Goodness and our existence is to showcase and then experience that goodness.
pheeeew, out of breath.........finger breath
as a side note to your discussion with [MENTION=4212]Peguy[/MENTION], I don't really understand the assertion that parents want relationships with their children because the children eventually will become their equals. If we just wanted beings equal to us We would just interact with other adults rather than waiting around for our children's brains to get done cooking. Obviously motivations for having children are different, and beings able to determine the exact motivation is elusive to me, I don't think most peoples answer would me "To recreate myself".