It is more false than it is sexist.

"God" is by definition the origin and creator of the world/universe/cosmos, which means that God transcends and includes all that constitutes this or any world/universe/cosmos, which necessarily includes all ideas, categories, and labels pertaining to this or any world/universe/cosmos.

Referring to God as "He" or as "She" is essentially no different from referring to God as "tree" or as "fire" or as "telephone" because all of these words - he, she, tree, fire, telephone, anything - are but the result of God's (by definition of God, regardless of whether God exists) creation.

God is everything because everything by definition originates from God. God is not He or She, Masculine or Feminine. God is the originator and creator of these ideas with which to begin, meaning God is both and neither, for God transcends and includes all.

God is simply the Ultimate, Infinity itself if you will, and it's silly to refer to this Reality as a result of the patriarchal society in which most of us have been living - as a He or She or It - because God is simply God.

Female is not a race. Male is not a race. Human is a race. He created Man in his image. Male as female is a derision of Man, as Man refers to Human. He is an all encompassing statement - male, female, or an unknown power. She is merely a specification of a general term by appending the letter "s". Just as "all men are created equal", men is all encompassing yet biased and interpreted, and so it is impossible to pretend to understand God's will and the intentions of a precarious idea.

I think it is unfair to consider to use of male pronouns to be sexist when referring to God.

Contemplate that the questioner capitalized the name of God. Not "a god" or some other placeholder phrase that insinuates inclusiveness of all ideologies (supreme being, creator, etc.)

I am an exception, as I use the word God to refer to the great unknown, and not as an acknowledgment of any scripture. That being said, when I hear others use the word God, I presume they mean a scripture God, traditionally referred to as a father. I am comfortable inventing my own belief – others are not. They rely on books that have pre-determined the words they use.

By all means, have your god be a woman, or a genderless angel-thing, or an altogether traitless mist or essence. A greater diversity in god references might help undermine the arrogance with which people judge each other needlessly.