So anything conservatives say is supposed to be God's work, and all else is a threat to it. Authorities and conservatives eliminate all opposing realities by saying it is not the Magisterium. One problem with the Magisterium concept, along with other types of authoritarianism, is the assumption that there is a truth which exists, and the true believers adhere to it and purify it. That concept is mindless. No one can produce a perfect truth, or even a totally adequate truth, or arbitrate it for someone else.
People can only work towards it through increased knowledge and evidence.
Truth is the communicated representation of unified reality, which is approximately the same thing as objective reality. Even if it exists at a source, it doesn't automatically get to a receiving point. Even if one person or a piece of paper has perfect truth, it doesn't automatically jump into another person's mind. Through everything humans can produce for communication, reason and study. Therefore, there can be no lines around truth.