Neither of these bands has the word "Cathedral" in their names.
As for the use of religious imagery and names in doom metal, it is often used to create a sense of atmosphere and mood rather than to convey any specific religious message. Doom metal is a subgenre of heavy metal music that is characterized by its slow tempos, dark and heavy riffs, and pessimistic or melancholic lyrics. The use of religious imagery and names in this context can help to create a sense of foreboding and dread, which is in keeping with the overall tone of doom metal music.