What is defined as a publicly observable event that evokes faith or worship?

The term described in the question refers to a miracle. Miracles are instances where a divine power intervenes in the natural order of the world, often resulting in events that are extraordinary and beyond human explanation. These events can inspire awe and wonder, prompting individuals or communities to respond with faith or worship. Miracles are typically seen as signs of divine presence or action, making them publicly observable and impactful to those who witness them.

The other options do not fit this definition as closely. A decree is a formal order that may not involve a demonstrative or miraculous element. A prophecy involves a foretelling of future events but does not necessarily evoke an immediate act of faith or worship through observable phenomena. Atonement refers to reconciliation between God and humanity, often related to the sacrifice made for sin, but it is not an event that is publicly observable in the same direct way that a miracle is. Therefore, the correct answer aligns well with the concept of an observable event that inspires faith and worship.