Regardless of whether Lin Li admitted it or not, the five high priests of the Darkness Shrine and the chief high priest, Sendros, all regarded Lin Li as the incarnation of the God of Darkness. Now that the incarnation of the God of Darkness had fallen into the large rift, the ones who knew his possible identity could not help but feel worried, because they didn't know if he was dead or alive. It was not simply an issue of faith, because everyone knew what the incarnation of the God of Darkness meant for the Darkness Shrine.
In the past, the Brilliance Shrine was continuously suppressing the Darkness Shrine, and even induced fear within the Supreme Council at some point, all because of Willen the son of the Holy Light. If the Darkness Shrine also had their own God of Darkness' incarnation, their rise would definitely be unstoppable even if they didn't surpass the Brilliance Shrine. They might even be able to return to their former heyday.
