As the two most populous Muslim nations carrying the status of precarious democracy, Indonesia and Turkiye are still trying to be committed to their credentials as nations that hold dear their multireligious community. While Indonesia follows the value of Pancasila to keep interfaith and intercultural solidarity, Turkiye still considers the value of secularism as a core concept to equally treat diverse religious and cultural communities of Turkiye. While interfaith engagement in the context of Indonesia is much stronger and visible, discussions about interfaith engagements in Turkiye have been refrained due to several reasons. This paper will explore the dynamics of interfaith engagements in Indonesia and Turkiye, especially between Muslims and Christians (particularly Catholics) after the Declaration of Human Fraternity between Vatican and al-Azhar through the theory of interreligious engagement and the theory of democratization.