You have to remember back when The Bible was written, many people were sexists and racists. The man dominated the entire world, and women had absolutely no power. If you look in the Middle East, it's still that way for the most part. To say He meant he had immense power and was important, to say she would have degraded him at the time.

And the reason it has not changed is pretty simple. God has been referred to as he for the past 3000 years, I don't think it's gonna change by now. Also today, he is accepted as a form of referring to something without being gender specific. Another loop hole in the loop hole we call American English.

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