Originally posted by: dawheat
To answer the question on why the Catholic church only allows men to become priests- the answer can be summed up through two statements:
1. They beleive that Christ chose his Apostles from only men by design, not by chance.
2. They, as the church, have no right or power to go against God's plan or design
Priestly ordination is considered the continuation of Christ's calling of his Apostles. You can read a pretty good write up at:
http://www.domestic-church.com/CONTENT.DCC/19990301/SCRMNTL/ordin_w%27men.htm
Couple relevant paragraphs:
The fact the Gospels and the Acts of the Apostles attest that this call was made in accordance with God's eternal plan; Christ chose those whom he willed (cf. Mk 3:13-14; Jn 6:70), and he did so in union with the Father, "through the Holy Spirit" (Acts 1:2), after having spent the night in prayer (cf. Lk 6:12). Therefore, in granting admission to the ministerial priesthood,(6) the Church has always acknowledged as a perennial norm her Lord's way of acting in choosing the twelve men whom he made the foundation of his Church (cf. Rv 21:14). These men did not in fact receive only a function which could thereafter be exercised by any member of the Church; rather they were specifically and intimately associated in the mission of the Incarnate Word himself (cf. Mt 10:1, 7-8; 28:16-20; Mk 3:13-16; 16:14-15). The Apostles did the same when they chose fellow workers(7) who would succeed them in their ministry.(8) Also included in this choice were those who, throughout the time of the Church, would carry on the Apostles' mission of representing Christ the Lord and Redeemer.(9)
Furthermore, the fact that the Blessed Virgin Mary, Mother of God and Mother of the Church, received neither the mission proper to the Apostles nor the ministerial priesthood clearly shows that the non-admission of women to priestly ordination cannot mean that women are of lesser dignity, nor can it be construed as discrimination against them. Rather, it is to be seen as the faithful observance of a plan to be ascribed to the wisdom of the Lord of the universe.
The presence and the role of women in the life and mission of the Church, although not linked to the ministerial priesthood, remain absolutely necessary and irreplaceable. As the Declaration Inter Insigniores points out, "the Church desires that Christian women should become fully aware of the greatness of their mission: today their role is of capital importance both for the renewal and humanization of society and for the rediscovery by believers of the true face of the Church."