Dear respected brothers and sisters,
As-salamu alaykum
This is not specific to the Quran and thus in my humble view, there need not be an exhaustive discussion around the Arabic language with regards this as the Bible also makes use of the 'masculine' to address God.
God is not a gender or a creation.
However, I feel the masculine gender has been used to remind us of his
'headship', 'leadership' and
‘sovereignty’ over His entire kingdom. Certain leadership/ headship roles have been assigned to males. For example, please kindly see verse 4:34 and the term
'qawwam' (manager / a securer / protector). Also spiritual guides / leaders such as Prophets in the Quran have also arguably only been men. See
'men' of the heights
[1] which supports this. Also another related Q&A may also share insights as to why certain roles have been assigned to men in particular
[2].
Thus in the language of humans and the gender roles assigned, the masculine has arguably been used.
However, this
does not mean that the female gender is undervalued, as the Quran goes
out of its way to show balance and equality in matters pertaining to spirituality and accomplishment. (33:35)
I hope this helps, God willing,
Joseph
REFERENCE:[1] Men of the Heights?http://quransmessage.com/forum/index.php?topic=577.msg2041#msg2041[2] Can Women Lead Mixed Congregational Prayers?http://quransmessage.com/forum/index.php?topic=164.msg427#msg427