If a future Pope reversed the Church’s position on gay marriage, would you also reverse your position on gay marriage?The word Pope could be substituted for “religious leader” to make this less Catholicism-centric, but the Catholic Church is fairly unique in that it’s doctrine trumps even the Bible in the eyes of its congregation. Seeing how the Pope is the infallible spokesperson for the Church, his word matters immensely.
Now, let’s look at what the possible answers mean. If a believer who opposes gay marriage answers in the affirmative, they show that their assessment of morality and their opinions of what is or isn’t discriminatory are based solely on authority. Whatever the Church thinks is how they think. The Pope is the Borg Queen in this scenario. If the believer instead says they would maintain their opposition of gay marriage against the Church, then we can know for sure that their belief is in fact a product of their own reasoning--at the cost of being a "bad Catholic."
Neither option is at all palatable to the believer, so if you pose the question, expect a refusal to answer. Most often I get, “the Church would never change their position so the question is moot.” That may be, but claiming certain knowledge of the future is a childish dodge for people with a distaste for hypothetical. Nevertheless we can’t force an answer out of them. This isn’t the Inquisition. (Speaking of which, poor Galileo would say that the Church sometimes, eventually, changes their position.) Simply posing the question is enough for the believer to formulate an answer, even if they see the trap set for verbalization. Consider the point made.