There are 32 teams in the NFL. And, on Week 1 of each season, each team thinks it has what it takes to win the Super Bowl; each team has its legion of fans who hopes and believes the same thing.
First answer: despite the fact that 31 teams are wrong, and their fans are mistaken, there
is one team that’s right, and whose fans’ belief is proper. (In other words, although there are many who are wrong, that does not imply that one isn’t right.)
Second answer: As in any question that isn’t answerable with axioms or empirical evidence, we utilize the “illative sense” that Blessed John Henry Newman discusses in his
Essay in Aid of a Grammar of Assent. This sense enables us, as individuals, to engage the whole range of our experiences and synthesize them, in order that we might reach a conclusion. However, since we’re experiencing them and engaging them
individually, we therefore reach conclusions
individually. As a result, there is no single answer which each person is forced to accept. Nevertheless, this does not mean that each answer reached by each person is objectively correct. (In other words, the fact that there are
many answers, each of them honestly believed by individuals, means that there will necessarily be multiple (and probably, mutually exclusive) answers. Each person must be allowed to reach his own conclusion… but that doesn’t mean that each conclusion rises to the same level of Truth.)
Third answer (and really,
this is the one you’re asking about… but it doesn’t work unless you assent to the previous two assertions): Christians believe – based on the witness of the People of God in earlier days, and on the witness of Christians and others in the so-called “Common Era” – that God has acted in history and revealed Himself and His Providence to humans throughout time. Based on their witness – not only as reported in Scripture but in the living history of the Church in the past 2000 years – engages our illative sense and allows us to recognize the truth of God’s Self-Revelation.
(Notice that the first two points are critical in rebutting potential objections to this conclusion: the fact that there are other opinions, and that these opinions are held honestly and fervently, does not mean that our belief in Christianity is unreasonable. In fact, it demonstrates to us that there
should be 4,200 religions in the world – but that we, based on the data before us – believe that Catholic faith
is the fullness of the Truth.)