Final answer:
The authors of PREP imply that all Christians are spiritually equal regardless of their societal role, as faith, Gospel, and baptism unify them, rejecting the division into 'spiritual' and 'temporal' estates as an artificial construct.
Step-by-step explanation:
The question 'Are spiritual and religious the same thing for the authors of PREP?' relates to the interpretation given by authors about the distinction between spiritual and religious people in a historical context. The quote indicates that the authors believe there is no real distinction between spiritual and temporal estates among Christians, as all followers of Christ are part of a single body where baptism, Gospel, and faith are unifying elements. The reference to 'the artful lie and hypocritical invention' seems to criticize the division of society into different estates or classes, suggesting a more egalitarian view where all who share in Christian practices are considered spiritually equal.