etc.) who convert to Catholicism are usually not baptized, but instead are asked to make a simple profession of faith at Mass on an ordinary Sunday. Confirmation usually follows (though not always), and the convert proceeds to receive first communion. Eastern Christians (Eastern Orthodox, Oriental Orthodox, and Assyrians), are only asked to make a simple profession of faith and then begin participation in the Eucharist without having to be confirmed due to the Catholic Church recognizing eastern Christian sacraments. Eastern Christians who convert to the Catholic Church are automatically enrolled into the eastern rite corresponding to the Church they originated from regardless of what Church they entered the Catholic Church through. The amount of instruction before reception varies depending on how active the person has been in their Christian life, and how informed they are about the faith. Validly baptized persons coming from previous denominations do not have to be enrolled in RCIA because the Church does not consider them catechumens since their baptism has already made them Christians. Private instructions may be given by a priest, which can last from a few weeks to a few months at most. After instructions have ensued, the person may be asked to pick a sponsor for confirmation if the pastor decides to perform the sacrament. Mormons, Jehovah's Witnesses, Oneness Pentecostals, Christadelphians, Christian Scientist, and other groups who hold to nontrinitarianism and/or who do not baptize in the "proper" Trinitarian formula are received into the Catholic Church through baptism due to the Catholic Church not recognizing nontrinitarian baptisms. Quakers and members of the Salvation Army are also baptized because neither church practices baptism. Converts into any of the Eastern Catholic Churches, 23 sui juris Churches in full communion with the Bishop of Rome, are usually received by the traditions of that particular Church. Eastern Orthodoxy In the Eastern Orthodox Churches there are different opinions held by bishops and theologians on how to receive Christians coming from other denominations. Some will only accept Eastern Orthodox baptism done by triple immersion, and thus will rebaptize all converts. Generally, most jurisdictions will accept baptism done in another denomination by economy, as long as it has been done with water in the name of the Trinity; this is the position held by the Ecumenical Patriarchate of Constantinople. Most converts from other Christian denominations with baptisms in the Trinitarian formula (Catholics, Protestants, Oriental Orthodox, Assyrians) are received by