@juglugs Even things that are not physical have a gender, like happiness, feelings, thoughts, etc.
Also when talking about G-d we will sometimes anthropomorphize so that it will help us be able to relate. Like if we say G-d's hand, we don't mean an actual hand but it helps us to understand.
All of the other "gods" that you are referring to all have a corporeal form. Our G-d is a rejection of all those other "gods" .