You cannot just say that when God's word says something that calls for a different policy. And that's the case, no matter if this is the subject of the disagreement or something else.
Where in Scripture does it say that women can't be priests (or priestesses)?
In case you're not aware, it says ...
"There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus"
... in Paul's letter to the Galatians.
Also, Peter wrote, "But you are a chosen people, a royal priesthood, a holy nation, God’s special possession, that you may declare the praises of him who called you out of darkness into his wonderful light. Once you were not a people, but now you are the people of God; once you had not received mercy, but now you have received mercy." This doesn't say that this applies to men only, especially in the light of the above.
The prophet Joel and Luke (in Acts) both wrote, “And afterward, I will pour out my Spirit on all people.
Your sons and daughters will prophesy [no difference!), your old men will dream dreams, your young men will see visions."
So, where is the Scripture that contradicts these writings and says that only men can be priests (of the New Covenant)?