The reformation was sparked by the position of what document?

The Reformation was largely sparked by Martin Luther's 95 Theses, a document he posted in 1517 that criticized the Catholic Church's practices, particularly the sale of indulgences. This document challenged the authority of the Church and called for a return to biblical teachings, emphasizing faith and scripture over tradition. Luther's ideas quickly spread, igniting widespread theological debate and leading to the establishment of Protestantism.