Read the summary. pope innocent iii called for a crusade against european heretics (1). these crusades were against fellow christians because their interpretation of christianity did not align with the official doctrines of the catholic church (2). church doctrine forbids physical attacks against fellow christians, so the catholic church hired muslim mercenaries to carry out the crusades (3). the news of the catholic church conspiring with muslims resulted in the beginning of the protestant reformation (4). which critiques the factual accuracy of the summary? while parts (1), (2), and (3) are accurate, part (4) needs revision. while parts (3) and (4) are accurate, parts (1) and (2) need revision. while parts (1) and (2) are accurate, parts (3) and (4) need revision. while parts (2), (3), and (4) are accurate, part (1) needs revision.