Many faiths consider themselves the children of God. Women are limited as to how many children they can have whereas men are not. Theoretically a man would have a billion kids if each sperm got to an egg. Also, in cultures thousands of years ago, it was men who were the authority figure so God must be a man. However, if this bothers you, you could go become a Reform Jew. They have neutered God, taking out all references to him as a male from their prayer book. Instead of calling him King of the Universe like most Jews, they call God the Ruler of the Universe. I do not thing any other group has done more to neuter God.