Some Catholics do call themselves Christians, but what they call themselves is irrelevant. They hold to the essentials of the faith.
Some of the things the Catholics believe
https://www.vatican.va/archive/compendium_ccc/documents/archive_2005_compendium-ccc_en.html
16. To whom is given the task of authentically interpreting the deposit of faith?
85-90
100
The task of giving an authentic interpretation of the deposit of faith has been entrusted to the living teaching office of the Church alone, that is, to the successor of Peter, the Bishop of Rome, and to the bishops in communion with him. To this Magisterium, which in the service of the Word of God enjoys the certain charism of truth, belongs also the task of defining dogmas which are formulations of the truths contained in divine Revelation. This authority of the Magisterium also extends to those truths necessarily connected with Revelation.
19. How is Sacred Scripture to be read?
109-119
137
Sacred Scripture must be read and interpreted with the help of the Holy Spirit and under the guidance of the Magisterium of the Church according to three criteria: 1) it must be read with attention to the content and unity of the whole of Scripture; 2) it must be read within the living Tradition of the Church; 3) it must be read with attention to the analogy of faith, that is, the inner harmony which exists among the truths of the faith themselves.
96. What does the “Immaculate Conception” mean?
487-492
508
God freely chose Mary from all eternity to be the Mother of his Son. In order to carry out her mission she herself was
conceived immaculate. This means that, thanks to the grace of God and in anticipation of the merits of Jesus Christ, Mary was preserved from original sin from the first instant of her conception.
97. How does Mary cooperate in the divine plan of salvation?
493-494
508-511
By the grace of God Mary was kept free from every personal sin her whole life long. She is the one who is “full of grace” (
Luke 1:28), “the all holy”. When the angel announced to her that she would give birth to “the Son of the Most High” (
Luke 1:32), she freely gave her consent with “the obedience of faith” (
Romans 1:5). Mary thus gave herself entirely to the person and work of her Son Jesus, espousing wholeheartedly the divine will regarding salvation.
182. What is the mission of the Pope?
880-882
936-937
The Pope, Bishop of Rome and the Successor of Saint Peter, is the perpetual, visible source and foundation of the unity of the Church. He is the vicar of Christ, the head of the College of bishops and pastor of the universal Church over which he has by divine institution full, supreme, immediate, and universal power.
185. When is the infallibility of the Magisterium exercised?
890-891
Infallibility is exercised when the Roman Pontiff, in virtue of his office as the Supreme Pastor of the Church, or the College of Bishops, in union with the Pope especially when joined together in an Ecumenical Council, proclaim by a definitive act a doctrine pertaining to faith or morals. Infallibility is also exercised when the Pope and Bishops in their ordinary Magisterium are in agreement in proposing a doctrine as definitive. Every one of the faithful must adhere to such teaching with the obedience of faith.
197. How does the Virgin Mary help the Church?
965-970
974-975
After the Ascension of her Son, the Virgin Mary aided the beginnings of the Church with her prayers. Even after her Assumption into heaven, she continues to intercede for her children, to be a model of faith and charity for all, and to exercise over them a salutary influence deriving from the superabundant merits of Christ. The faithful see in Mary an image and an anticipation of the resurrection that awaits them and they invoke her as advocate, helper, benefactress and mediatrix.
198. What kind of devotion is directed to the holy Virgin?
971
It is a singular kind of devotion which differs essentially from the cult of adoration given only to the Most Holy Trinity. This special veneration directed to Mary finds particular expression in the liturgical feasts dedicated to the Mother of God and in Marian prayers such as the holy Rosary which is a compendium of the whole Gospel.
210. What is purgatory?
1030-1031
1054
Purgatory is the state of those who die in God’s friendship, assured of their eternal salvation, but who still have need of purification to enter into the happiness of heaven.
211. How can we help the souls being purified in purgatory?
1032
Because of the communion of saints, the faithful who are still pilgrims on earth are able to help the souls in purgatory by offering prayers in suffrage for them, especially the Eucharistic sacrifice. They also help them by almsgiving, indulgences, and works of penance.
240. What is the purpose of holy images?
1159-1161
1192
The image of Christ is the liturgical icon
par excellence. Other images, representations of Our Lady and of the Saints, signify Christ who is glorified in them. They proclaim the same Gospel message that Sacred Scripture communicates by the word and they help to awaken and nourish the faith of believers.
258. Why does the Church baptize infants?
1250
The Church baptizes infants because they are born with original sin. They need to be freed from the power of the Evil One and brought into that realm of freedom which belongs to the children of God.
283. What is the meaning of transubstantiation?
1376-1377
1413
Transubstantiation means the change of the whole substance of bread into the substance of the Body of Christ and of the whole substance of wine into the substance of his Blood. This change is brought about in the eucharistic prayer through the efficacy of the word of Christ and by the action of the Holy Spirit. However, the outward characteristics of bread and wine, that is the “eucharistic species”, remain unaltered.