Our questioner knows the Bible well, for he basically quoted verbatim the Second Commandment as found in Exodus and Leviticus. While the meaning of this commandment seems apparent, a closer examinatiom helps us to realize the deeper truth the Lord is trying to tell us here and apply it in our lives.
Q: How can women promote change within the Church, especially since they are not allowed to become clerics?
Women have been instruments of change within the Church since the first exultation of Easter joy rang out in the heart of the Church. The Lord chose to first proclaim to women the message of His triumph over sin and death and entrusted them to rouse the Church to the joyful exultation of His victory.
Q: What does the Church teach with regard to the perpetual virginity of the Blessed Mother?
The perpetual virginity of Mary -- that she retained her virginity throughout her entire earthly existence -- is a dogma of the Catholic Church. The Church teaches it because, like the Resurrection of the Lord, it is a historical fact. The Church cannot teach as fact something that didn't happen. That doesn't mean, however, that it doesn't contain miraculous elements, nor should we overlook the theological significance of it.