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What are the requirements for joining the Catholic church as an adult?

I'm interested in all the requirements, including whether a previously baptized Protestant would be required to (or forbidden from?) being re-baptized as a Catholic.

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This looks like a job for... Canon Law 869

Can. 869 §1. If there is a doubt whether a person has been baptized or whether baptism was conferred validly and the doubt remains after a serious investigation, baptism is to be conferred conditionally.

§2. Those baptized in a non-Catholic ecclesial community must not be baptized conditionally unless, after an examination of the matter and the form of the words used in the conferral of baptism and a consideration of the intention of the baptized adult and the minister of the baptism, a serious reason exists to doubt the validity of the baptism.

The gist of it is, there's no need for re-baptism, being baptized by anyone in the name of the Father and of the Son and of the Holy Spirit is sufficient.

And in time of need, it is valid for anyone to baptize anyone else. For instance, if you were in a really bad accident and I came upon you and said, "boy, you look pretty rough are you ready to meet the Lord" and you said, "Lord who?" and I, while dressing the wounds of your mangled body, managed to convince you of the truths of the Catholic Church and you decided that you wanted to die a Christian, I could baptize you and even if you managed to live, you wouldn't need to be re-baptized.


The requirements for joining the Church are different for unbaptized folks than for baptized. Either way, the RCIA process is followed and culminates with all three sacraments of initiation Baptism, Eucharist and Confirmation (with the exception of Baptism for the already Baptized) .

The liturgical part of the process can be found in this book I bought it and read through it because I'd like my dad to become Catholic, but it's not much help really.

What one would need to do in order to become convert to Catholicism, would be largely up to the priest. I have a friend who is a convert who showed up on a priests doorstep 30 some years ago and the priest gave him one-on-one instruction until he joined the church. But others, Lutherans in particular, say "all the priest said to do was make a general confession", other parishes have RCIA programs led by lay ministers similar to Catechetical instruction for children leading up to their confirmation.

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this is a nitpick but I would list the sacraments of initiation in the opposite order... –  Ben Dunlap Dec 28 '11 at 22:08
    
@BenDunlap your wish has been granted. Let's see how long it takes to filter down to all American parishes. –  Peter Turner Mar 9 '12 at 16:20
    
Is confirmation/chrismation necessary for Orthodox converts? (Or even some converting Anglican clergy?) Also, the answer still seems to put eucharist before confirmation; isn't it the other way around? –  John Peyton Sep 6 '13 at 3:57
    
@JohnPeyton AFAIK the Eucharist/Confirmation issue is up to the local Bishop. Traditionally (and in the Eastern Rites), it was Confirmation before First Communion, but it's flipped in much of the west, making Confirmation seem like the right of passage it was never meant to be. I'd imagine confirmation is unnecessary for Orthodox converts since the Catholic Church holds their other sacraments to be valid. Here is the question on the Catholic Answers forum –  Peter Turner Sep 6 '13 at 11:55
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