No. All liturgical celebrations should teach us something about our faith. Sacraments point us to God and gives us the grace to live out the Christian faith. Marriage is a sacrament and as such has a liturgy connected with it.
The Liturgy of the Word is an integral part of all sacramental celebrations. The readings associated with the Rite of Marriage are meant to teach us something about Christian marriage. When a priest or deacon gives a homily, he will present a message to the assembled community that will expound on the readings by making them practical to the particular couple professing their wedding vows. Since this is a Rite of Marriage and therefore a Rite of the Catholic Church the readings must be taken from Scripture in accordance with the Rite of Marriage. A list of selected Scripture verses for the rite is available from your parish.