God Is Simply God
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.