Merlin suddenly recalled the Church of Light in the Glorious Land, which was the birthplace of Spell Casters. All Spell Casters came from the Glorious Land, and from there, they set foot into tens of thousands of dimensions.
Before they set foot into these dimensions, Spell Casters had already wiped out or exiled the many gods of the Glorious Land. In short, there were no more gods, so why would the Church of Light still exist today?
Merlin had always felt that the Glorious Land was extremely mysterious. Perhaps a massive calamity had happened, covering up some secrets, obfuscating matters. At the very least, Merlin had no way of ascertaining what had happened in the Glorious Land. He did not even know how to return there.