Recently, political philosophers have debated the role of religious reasons in public deliberations, such as appealing to religious convictions and religious classics. Exclusivists, such as Rawls, Quong, Hartley, and Watson, argue that democratic governments and citizens should restrict or exclude the use of religious reasons in making laws and policies, while inclusivists, such as Gaus, Vallier, and Billingham, oppose such categorical exclusion. Nevertheless, the debate mainly focuses on the role of religious reasons in public deliberation. In this paper, I will argue that religious behaviors—defined as highly altruistic actions motivated by religious beliefs, such as dedicating substantial time and effort to serving the poor and advancing the common good—can exert positive influences on public deliberation. Through this kind of altruistic action, religious believers can subtly influence non-religious citizens. While religious believers may not rationally persuade non-religious citizens through religious reasoning, the altruistic actions exhibited by religious believers could emotionally inspire admiration and motivate non-religious citizens to learn more about those religions. This enhances mutual understanding among different religious and secular sects and thus improves public deliberation. Furthermore, I argue that the improved understanding fostered by religious behaviors can facilitate exclusivism and inclusivism to overcome certain philosophical challenges, such as the problems of incompleteness and anarchy, which are among the most frequent criticisms directed at exclusivism and inclusivism. Hence, this paper highlights an aspect overlooked in the exclusivism–inclusivism debate: no matter whether the democratic government and citizens should permit or restrict religious reasons, religious behavior is still beneficial in public deliberation.