Neither Religious Caste or Worker Caste will do, you don’t want to be a religious nut or a worker having to take orders from alien scum...so you’re left with one other choice…
“I guess I will be part of the Warrior Caste for Religious and Worker seem to be too silly.” you say confidently.
The alien shakes his head and frowns, “This won’t do!” he says as he points a gun at you.