Shiva is represented with 3 lines on his/her forehead.
The first two represent maleness and femaleness, the third represents a third gender, which is more than just the synthesis of male and female, but can generally be referred to in that way.
Given gender, in Christian terms, deals with power structure and reproductive rights, God likely has none, in the human sense. He might be considered male, as he is the grand patriarch, but that association is only based on his role of having authority over us. Using specifically Christian iconography, the symbolism of creation of humanity and of the universe itself, is a clearly female reference.
Biblical interpretation, done within highly gender stratified societies, obviously emphasizes the former, though instances of the latter are there, I'm sure.
I'm still with the Muslims though, stop trying to define what or who God is. I can only imagine how pissed that would make him/her.