When a Catholic makes an act of consecration to a saint, it is not preempting love of God. Catholics, like any other Christian, only worship God. They honor and respect the saints as perfect examples of living a Christian life. When someone loves other people there is no competition. A child can love both mother and father. Love is limitless. Only hatred is confining.
An Act of Consecration to the Virgin Mary does not take away any love that we have for God. In fact, the more we love God, the more we love those close to Him. The Blessed Virgin Mary is the closest human being to God ever created by Him. In honoring her, we revere her Creator, Almighty God. Prayers, devotions, and acts of consecration are seen as ways of getting closer to God through imitation of the saint being well-regarded.
All devotions, including those to the Blessed Virgin Mary, should lead to Jesus Christ. Jesus Christ is our primary mediator between His Father and us. It is a better knowledge and love of God that we Catholics gain through devotions to the saints, who are His closest friends. In the Act of Consecration to Mary we are asking her to pray with us and for us to her Son.
We look to Mary as a source of inspiration on how to live our lives. Mary was totally obedient to the Word of God. Her fiat, “Thy will be done,” is the answer that all Christians should give to the Lord. She lived a life of humility and service. This is the great legacy she leaves for us in order to follow her Son more devoutly. Her life is one of perseverance. Even during the dark trials of her Son’s crucifixion, Mary was a pillar of faith—a beacon of hope and comfort to those around her. By modeling our lives after her, we too become closer to her Son.
The Rosary, Litany of Loreto, various novenas to her different titles, wearing the scapular, Miraculous Medal, and praying the Little Office of the Blessed Virgin Mary do not take anything away from Almighty God. Like non-Catholics who ask one another on earth to pray for them to God, Catholics ask the living saints to continue that prayer to God in heaven on our behalf. We most certainly can pray to Jesus directly, but we can also augment our prayer to Jesus with the help of His friends, the saints.