That was part of a polemic of Paul in a specific cultural context, given for pastoral reasons to a religious community that was at war with itself. And in truth, what you are emphasizing is a distillation of Paul's thought that only really took shape in the 16th century in Europe, ignoring the broader themes in Paul's letters in favor of a simple message of otherworldly salvation through faith alone. It might well be useful, as there is a potential transformative power in entrusting oneself to a higher power, but I don't think that is going to resonate with everyone. And when that type of religion is used to justify hatred, prejudice, and ill-will, I don't see how it can be salvific in the fullest sense of the word.