Sombra your analogy is a bit reaching. Within Disco your faction, your ID and your name defines your character and what it can do for the explicit purpose of preventing as Zelot said, textbook metagaming.
The character in question may be working with the religious faction but being apart of it allows that person to do a role of two people, a clear use of metagaming, which I believe is the principle folks are trying to convey.
