‘Is religion a threat to Africa’s unity?’ (short 300-word Response)
‘Do White South Africans Miss Apartheid?’ (short 300-word response)
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Personally, I subscribe to the projectionist school, which states that religion, gods, and God are reflections of human nature or some human phenomenon. Note that I am not making a judgment regarding ontological religious questions in this answer.

Some examples: Karl Marx viewed God belief as the product of proletarian suffering under exploitative capitalist conditions; Sigmund Freud considered religion to be the product of guilt and unconscious neurotic primal drives; Emile Durkheim viewed religion as the product of society worshiping itself; Ludwig Feuerbach considered God-belief as the projection of ideal human qualities (love, justice, etc.) into an invisible entity.

The ancient Greek Xenophanes rightly saw this over two-thousand years ago. He offers what is probably my favorite quote,

“[I]f cattle or horses or lions had hands and could draw, And could sculpt like men, then the horses would draw their gods Like horses, and cattle like cattle; and each they would shape Bodies of gods in the likeness, each kind, of their own.”

Turning to your question, gods and God have “genders” because ancient, classical, and pre-historical religions emerged in patriarchal, matriarchal, or hierarchical societies

In the former patriarchal Abrahamic religions, minus possible exceptions, men penned the stories about God that would be codified into sacred religious texts. This reflects widely in the male textual adjectives: warrior, Lord, Father, husband, protector, aggressor, etc. There are other instances in which female characteristics are ascribed to the deity, although this is the exception.

In the pre–historical era, one finds fertility religions in which the feminine is strongly exaggerated in the form of cave (womb) rituals and goddess figurines. In many religions, there are gods and goddesses. Hinduism would be an example. Various traits of these deities are further projections of human nature: war, love, jealousy, procreation, tribal conflict, etc.

Long story short, because gender is a human feature, humans produce gods and God having them.