You miss the big picture, Jesus, Our Lord is God, the second person of the Holy Trinity. Do you accept that Jesus is God or do you regard Him as an an itinerant preacher in latter day Palestine?
Jesus offered Himself upon the altar of Calvary for the sins of many so says the institution narrative of the Mass. He offered Himself, therefore He is the High Priest. He offered Himself, therefore He is also the Victim, the only unblemished, acceptable offering to the Father on behalf of mankind; the contrast with the paltry sacrifices of the Old Law, doves, fowl, lambs and bullocks. Here was the most  perfect man of all mankind to take upon Himself the sins of the whole world, past, present and future.
Forget about gender, in the scheme of things which I have outlined above, gender theory pales into insignificance.