The same thing they have said in all ages: Repent and believe in the Gospel!
The " catholic " in the creed has a lower case C..... therefore this is the universal church, not the actual Catholic Church. So catholic = Universal Church Catholic = The Catholic Church ( The one with the Pope )
I think you are looking for the "Eastern Orthodox" church. It may be described very very roughly as a Catholic, Apostolic church that does not feel the need for the same hierarchical structure as say the "Roman Catholic" church.
In most countries, in most times, the Catholic Church only taxes the parishes, not individuals. Unless you can ask a more specific question, I would have to say that 1) there are no Catholic Church tax policies for people, and 2) The Catholic Church is the Mystical Body of Christ, and, thus, cannot be "weakened".
Saints (Sts.) Peter and Paul Catholic Church would be proper.
The Catholic Church is the Mystical Body of Christ, as such it is tasked with bringing people to Christ, and Christ to people in the sacraments. It is up to individual Christians to put their beliefs into practice, the Church itself does not normally address issues like this as the Church, it leaves these up to its members.
The Anglican Church is not called the Anglican Catholic Church, and the Catholic Church is not formally known as the Roman Catholic Church even though the Vatican is indeed located in Rome. Your question therefore would more accurately read, can an Anglican priest say Mass at a Catholic Church. The answer is, the Catholic religion does not allow Anglican priests to officiate at their rituals. The Anglican Church, despite being extremely similar to the Catholic Church in most respects, is nonetheless regarded by Catholicism as a heretical schism.
The Catholic Church was first... so, I guess you could just say "chrsitianity" or you could say the Catholic Church.
Not much specifically, the Catholic Church has always prayed that all protestants would return to the Church that Jesus Christ founded for their salvation.
The Catholic Church interprets the Bible to say that it was started with St. Peter, who was the first Pope.
When they say in the Apostles creed "I believe in the holy Catholic church" they don't mean the Roman Catholic church, which is odd in that the Roman (Latin rite) Catholic church is the TRUE church. If they were to say the Nicene creed which goes.....I believein one holy Catholic and apostolic church....they would have a problem in that they are not apostolic, that is not ordained directly in line from the apostles which catholic priests are. Realising this the Anglicans have changed the definition of Apostolic to mean following the gospel message(s) as originally preached by the apostles. In short Anglicans (low church, liberal church and hight church) are really protestants pretending to be Catholics.
The Great Bishop Fulton J. Sheen once said:"There are not one hundred people in the United States who hate The Catholic Church, but there are millions who hate what they wrongly perceive the Catholic Church to be." I would venture to say that there are very few people who actually hate Catholics, even of the few who truly hate the Catholic Church, even fewer of them hate their brother-in-law who is Catholic, or their next door neighbor who is Catholic, etc. . But the number of people who have been told lies and falsehoods about Catholicism is innumerable, and those people hate what they think the Catholic Church is, even if they have never hated a Catholic person.
The NICENE CREED