I'm Already a Baptised Christian. What Changes When I Become Catholic?

Already Part of the Family

If you were baptised as a Protestant, Anglican or Orthodox Christian, the Catholic Church already recognises you as a brother or sister in Christ. Your Baptism, if it was valid, joined you to Christ and, in a real though incomplete way, to His Church (CCC 818, 1271).

So becoming Catholic, for you, is not starting from zero. The Church calls it being received into full communion. You are not converting from unbelief to faith; you are completing a journey you began at your baptism.

You Will Not Be Rebaptised

Baptism can be received only once. It leaves a permanent mark on the soul. If your baptism was valid, the Catholic Church will not baptise you again. To do so would be to deny the reality of what God has already done.

How does the Church know your baptism was valid?

A baptism is valid if it was done:

with water, by pouring, sprinkling or immersion;
with the Trinitarian formula: “I baptise you in the name of the Father, and of the Son, and of the Holy Spirit”;
with the intention of doing what Christians do in baptism.

Baptisms in most mainstream Christian churches meet these conditions: Anglican, Lutheran, Methodist, Presbyterian, Uniting, Baptist, Pentecostal, Orthodox and many others.

The parish will ask for your baptismal certificate, or at least evidence of the baptism, such as a statement from a family member who was there. If there is genuine doubt about whether a baptism took place or was valid, the Church may baptise conditionally, using words that mean “if you are not already baptised, I baptise you.”

Some groups that use Christian language do not have valid baptism, because their understanding of the Trinity is different. In 2001, for example, the Church ruled that baptisms in the Church of Jesus Christ of Latter-day Saints (Mormons) are not valid, and baptisms by Jehovah’s Witnesses are likewise not accepted. People from those backgrounds are baptised when they become Catholic.

How Reception Works

You will usually join your parish’s RCIA group (see How Do I Become Catholic?), but your preparation is adapted to the fact that you are already a Christian. You will not be called a catechumen, and you will not take part in the rites meant only for the unbaptised.

You will learn about Catholic teaching, especially the areas where it differs from what you knew: the Eucharist, the sacraments, the Church and the Pope, Mary and the saints, Tradition, purgatory and the moral teaching of the Church.

When you are ready, you will be received at a Mass. This may be at the Easter Vigil, or at another time of the year: the Church allows reception of baptised Christians whenever they are prepared. The rite is short and simple:

You make a profession of faith. You say the Nicene Creed with the community, then add: “I believe and profess all that the holy Catholic Church believes, teaches and proclaims to be revealed by God.”
The priest receives you into full communion.
You are confirmed, unless you are coming from an Orthodox or Eastern Church, whose chrismation the Catholic Church recognises as valid Confirmation.
You receive Holy Communion, often for the first time as a Catholic.

Before your reception, you will usually make your first Confession.

What Will Feel Different?

Many people coming from other churches find that much feels familiar: the Scriptures, the Creed, the hymns, the love of Christ. But some things may take getting used to.

The Eucharist is the centre. For Catholics, Sunday Mass is not mainly about the sermon or the music. It is about Christ truly present in the Eucharist. You may find the homily shorter and the music plainer than you are used to. That is not because Catholics care less about preaching, but because the heart of the service lies elsewhere. (See What Is the Real Presence?)

Confession. Regular confession to a priest is new for most Protestants. Many converts come to treasure it. (See Why Do Catholics Confess to a Priest?)

Mary and the saints. Praying to the saints and honouring Mary may feel strange at first. Take your time. The Church does not require you to adopt any particular devotion, only to accept her teaching.

Sunday obligation. Catholics are obliged to attend Mass every Sunday and on certain holy days. For some, this feels like a rule; most come to see it as a gift.

A bigger family. You join a Church of over a billion people across every culture, with saints, traditions and spiritual riches stretching back two thousand years. It can feel overwhelming. It can also feel like coming home.

What You Bring With You

Becoming Catholic does not mean throwing away everything you learned before. Many converts bring a deep love of Scripture, a habit of personal prayer, a gift for hymn-singing or a warmth of fellowship that enriches their parish. The Catholic Church recognises that “many elements of sanctification and of truth” are found in other Christian communities (Lumen Gentium 8). What you received there was real. Full communion brings it home to its fullness.

Family and Friends

One of the hardest parts of becoming Catholic can be the reaction of family and friends from your former church. Some may be supportive; others may be hurt, puzzled or critical. Be patient and gentle. Explain your reasons honestly, without attacking where you came from. Many converts find that, over time, their relationships survive and even deepen.

Coming Home

Countless Christians have walked this path before you, from St John Henry Newman to ordinary people in every parish. Many describe it not as leaving something behind, but as finally arriving where they were always heading.