Why Get Married in the Church?
Sacraments have both a personal and Church dimension. While the wedding surely has deep personal meaning for the bride and groom and their families, the wider church has a stake in their marriage. Their sacrament builds up the whole Body of Christ.
Convalidaton
If a couple has already been married in a civil ceremony and wishes to bring their marriage to the Church in the Sacrament of Matrimony, they may celebrate a convalidation of their marriage. The benefits of convalidation are enormous: peace of heart, oneness with the Church, reception of the Sacrament of Matrimony and God's grace to help them live out their marriage well. It is best to speak with your local parish about the process to have your marriage convalidated.