The Brazilian religious field has witnessed in recent years, an intensification of conflicts and tensions involving the coexistence of various religious traditions, due to a significant expansion of the ballast of action of fundamentalist discourse which are part of various areas of the public sphere, such as culture, politics, economy, education, health, the environment, religion, etc., disastrous, and undesirable consequences, among other issues, a significant threat to religious freedom. Thus, the challenge of pluralism is to defend tolerance and promote interreligious dialogue from a combination of initiatives guided by ecumenism and laity, while fundamentalism deliberately refutes such strategies of reasonableness and social reconciliation and ostensibly radicalizes their opposition. This article aims to deepen the debate about the threat attributed by fundamentalisms to religious freedom, triggering to this end, an approach referenced both in the assumptions of the sciences of religion and in those of the decolonial/intercultural paradigm, achieved through a bibliographic review.