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."
Abrahamic religions
The Roman Catholic Church believes in observing abstinence and penance. For example, all Fridays through the year and the time of Lent are penitential days. The law of abstinence requires a Catholic from 14 years of age until death to abstain from eating meat on Fridays in honor of the Passion of Jesus on Good Friday. The United States Conference of Catholic Bishops obtained the permission of the Holy See for Catholics in the U.S. to substitute a penitential, or even a charitable, practice of their own choosing. Eastern Rite Catholics have their own penitential practices as specified by the Code of Canons for the Eastern Churches.