Because the Greeks didn't think that way. More can always be said on how Greek views on their deities worked, so if anyone else would like to write about this matter, please don't let this post stop you! For the meantime, OP, here's a previous thread that deals with just this question exactly. u/mythoplokos and u/JoshoBrouwers link their previous answers in-thread, whilst u/UndercoverClassicist provides a new reply in it:

• Several ancient polytheistic religions (like in Greece or Egypt) included female deities responsible for areas, that were traditionally men's jobs in the respective cultures (warfare, hunting, etc). How did deities like Athena for instance come to be?