Is God referred to as "Him" because "He" is a dominant figure? I would assume "perfect" means gender less?

Gods and Goddesses have always had a gender. The monotheists choose only to worship ONE male God and ignore the many Goddesses.

Note that Solomon's Temple originally had God and Goddess. In the 2nd century BCE Jewish Levite priests pushed Judaism into monotheism and kicked the Goddess out of their Temple.

no, it's simply because societies were patriarchal for a long time. Some people explicitly refer to God as "Her".

I tend to think that it goes back to the old rule in english of 'when unsure, default to the masculine', but I don't really know.

It's meant to shut up disobedient women. God is male, men are gods. Women are followers.

Or because men back then were considered godly by society

Perfect in Hebrew and Greek means complete. God is a male.

No. It's because he has has a humongous spirit penis.

gods referred to as "he" because misogyny

there are no gods, obviously