In the case of life or death situation the CC will recognize a baptism by anyone who does it in the name of the blessed Trinity. There are different circumstances that may require the CC not to rebaptise an individual but to validate the baptism.
For instance if the question of the understanding of the revealed Trinity doctrine was rejected by the individual conducting the baptism or not believed in as set forth from the Apostolic Traditions defined from the early Church councils. Or if it could not be proven that the baptism was done in the name of the Trinity as commissioned by Jesus Christ.
A case by case would need clarification for a valid baptism. It would be difficult to generalize all “protestant” baptisms are valid, because those claiming to the protestant tradition are not truly protestant for example JW’s and Mormons who believe in their man made doctrine of a trinity but not a Catholic biblical Trinity, would constitute an invalid baptism, that would need validation, not neccessarily rebaptism.
The key here is life or death situation; Those outside of the communion in the body of Christ (Catholic Church), and baptise their communities using the Trinitarian formula, can be seen as a matter of life and death situation outside the Catholic Church, although from a protestant perspective is not viewed that way. Thus the Catholic church would recognize the protestant baptism outside of her communion. Yet those protestant baptisms that are very close to the Catholic Traditions are never questioned about their validity and only require documentation to be accepted as valid.
The Eucharist can only be confected by valid biblical holy orders which is the bishop or priest. Without this valid priesthood established in Jesus Christ himself, you have no valid Eucharist.
The other subject of great importance to the Eucharist is for one to have the Catholic biblical faith as handed down to us from the scriptures and Apostolic Tradition, to be able to discern the body and blood of Christ in the Eucharist less the curse befalls one from
1Cor.11:27
Therefore whoever eats the bread or drinks the cup of the Lord unworthily will have to answer for the body and blood of the Lord. 12
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A person should examine himself, 13 and so eat the bread and drink the cup.
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For anyone who eats and drinks without discerning the body, eats and drinks judgment 14 on himself.
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That is why many among you are ill and infirm, and a considerable number are dying.
No one can partake of this valid Eucharist without their wedding garment “baptism”, less they be bound and tied then cast out from the “Wedding supper of the Lamb”. Some protestant (evangelicals, non catholics) denominations do not believe in baptism as a sacrament which “saves you now” (1Peter 3:21 This prefigured baptism, which saves you now.) but only a symbol of their profession of their Christian faith. That is why it is very important to arrive at the correct understanding of each baptism from protestantism, so that one may partake of the wedding feast of the lamb. Without this seal on their forehead, they lack protection, and cannot enter without their wedding garment “baptism” into the bridegrooms (Jesus) wedding feast.
Matthew 22:2
"The kingdom of heaven may be likened to a king who gave a wedding feast 2 for his son.
**6 But when the king came in to meet the guests he saw a man there not dressed in a wedding garment.
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He said to him, ‘My friend, how is it that you came in here without a wedding garment?’ But he was reduced to silence.
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7 Then the king said to his attendants, ‘Bind his hands and feet, and cast him into the darkness outside, where there will be wailing and grinding of teeth.’ 14
Many are invited, but few are chosen." **
ReturningToRome;7267985]Even though all Protestant Christians invoke the trinity and use water in baptisms, their beliefs differ widely concerning its efficacy. Yet I believe it is true that they are all accepted by the Catholic Church. On the other hand, even when a Protestant doctrine of communion as a sacrament is very similar to Catholicism, such as the Lutheran view, it is not a valid sacrament in the eyes of the Catholic Church. I think the latter is because of apostolic succession. I’m grateful, but I would like to be able to explain why Baptism is not similarly affected by apostolic succession.