You are right. “Universalism” is an opinion. “Eternal Torment” is an opinion. “Dispensationalism” is an opinion. “Preterism” is an opinion. The historic Christian view about eschatology is an opinion. Every position in theology is an opinion—every one of them claiming to go EXACTLY by the Bible or the teachings of Christ, or those of the apostles.
If the Bible had been dictated by God to its writers, then it is the only book in existence that is infallible and without error. But that position is also an opinion. Yet even if that position were correct, it wouldn’t help, since all we have is the multifarious interpretations of the various parts of the Bible (and they are opinions). Indeed, that’s what this forum is all about, isn’t it?—the sharing of opinions and attempting to back them up from the Bible—joyfully commending everyone with whom we agree, and castigating everyone with whom we disagree. (I realize this attitude does not apply to everyone who posts here. Many are genuine ladies and gentlemen who respect one another whether or not they agree).