The fact that they're better explained by other causes than the divine? The fact that people with similar experiences are objectively most likely to be factually incorrect in that specific domain? What good reason is there?

Edit: Consider all the people who have faith in some religion based on subjective personal conviction, and separate them into mutually exclusive groups. No one group is in the majority. Thus, your subjective personal conviction regarding religion is, best case scenario, more likely to be wrong than right.