What might lead to a person's agnosticism or atheism regarding prayer?

A person's agnosticism or atheism regarding prayer can often stem from the feeling that their prayers go unanswered. When individuals engage in prayer, they might expect a response or intervention from a higher power. If they do not perceive any changes or outcomes that they attribute to their prayers, they may begin to question the existence of an active deity or the efficacy of prayer in general. This lack of perceived communication or interaction can lead to feelings of doubt and ultimately foster a view of agnosticism or atheism.

The other options represent experiences that are typically affirming of faith rather than leading to doubt. For instance, feeling God's presence or receiving confirmation that prayers have been answered can reinforce belief in a deity and the practice of prayer. Similarly, believing in the power of positive thinking reflects a perspective that may emphasize individual agency and mental focus over divine intervention. Thus, the correct answer highlights a critical factor that can diminish faith in prayer as a meaningful spiritual practice.