My reason for resting the argument (such as it is) where I did is that as far as I can see it is the only one in town.
God certainly made them male and female, but there is nothing in Genesis which says that women can't be priests. I used to hear the old Anglo-Catholic line about the priest being in propria persona for Our Lord, which meant the priest had to be a man; I wasn't convinced when I was an Anglo-Catholic, and am not now.
It seems to me that the only defence that is not open to a charge of misogyny is the one I used - Our Lord had no female Apostles. How convincing it is is another matter - but it seems to be the only one - for whatever it is worth.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)