Actually, only a small percentage of saints have been declared Doctors of the Church. For a list see the link below.
Yes, St. John of the Cross was declared a Doctor of the Church by Pope Pius XI in 1926 for his profound theological and mystical writings that have contributed significantly to Christian spiritual growth and understanding.
No, Kiara is a pre-congregational saint so was not canonized. She was declared a saint long before the canonization process was instituted.
There is only one pope named Benedict who has been declared a saint and that is Pope Saint Benedict II who died in the year 685. There was no canonization process in place at the time so he would have been declared a saint by an early Church bishop at the request of the local Church.
No rock singer has been declared a saint
No, she has not been declared as a saint.
Devotion to Saint Anne is pre-congregational - long before the official canonization process was instituted . She has been considered a saint since the earliest days of the Church. Her cult was extended to the whole Church in 1584.
Fulton J. Sheen has not been declared a saint by the Catholic Church. However, in July 2019, the Catholic Church recognized a miracle attributed to him, clearing the way for his beatification, which is the step before sainthood. The beatification ceremony took place on December 21, 2019, in Peoria, Illinois, in the United States.
Mother Teresa has been beatified but not yet declared a saint.
St. Anne would have been declared a saint by the early Christian community during the earliest years of the Church. The canonization process was not instituted until over 1000 years later.
Saint Patrick was never officially canonized. However, he is still widely accepted as a Saint. The canonization process was not put into place until the 12th century. He would have been declared a saint by the early Church with the approval of the local bishop.
Saint Christina of Persia was scourged to death for her faith sometime in the very early years of the Church. No other information has survived. She would have been declared a saint by the early Christian community based on her martyrdom.
Saint Vitus was recognized as a saint without formal canonization procedures, as he lived in the early Christian era before the standard process of canonization was established by the Catholic Church. He is considered a martyr and has been venerated as a saint by both the Eastern Orthodox Church and the Roman Catholic Church for centuries.