Catholic theology
Catholic belief holds that the church exists both on earth and in heaven simultaneously, and thus the Virgin Mary and the saints are alive and part of the living church. Prayers and devotions to Mary and the saints are common practices in Catholic life. These devotions are not worship, since only God is worshiped. The church teaches that the saints "do not cease to intercede with the Father for us. ... So by their fraternal concern is our weakness greatly helped."
Idolatry
According to the "Catechism of the Catholic Church", "Idolatry not only refers to false pagan worship. Man commits idolatry whenever he honours and reveres a creature in place of God, whether this be gods, or demons (for example satanism), power, pleasure, race, ancestors, the state, money, etc." The manufacture of images of Jesus, the Virgin Mary and Christian saints, along with prayers directed to these has been widespread among the Catholic faithful.