I see. Castiel is town or an Apprendice/recruit, i heavily doubt that he is an apprendice
Why, you may ask?
First night none of us had any info, Castiel is unlikely to be chosen (the blue cult didn't recruit that night iirc, that might mean that the leaders encoutered each other or that just the blue cult didn't recruit cause of Mason/Neet reasons)
Second night, red cult is probably desperate
We have 3 cases here
1(i find this the most likely one):
The red cult recruited on the first night, and now the leader was forced to use its night action to promote the recruit to Apprendice, meaning that, if Castiel didn't get recruited on the first night, he is not converted rn
2(less likely):
The red cult recruited twice in a row, i think this is not a good idea tbh. Then, castiel is probably converted, as he roleclaimed a important role last day.
3(it exists, but i doubt it is the case):
The red cult didn't recruit first night, but knowing castiel's role, they converted him this night.
By this, my conclusion is that in any case that Castiel is converted at this point of the game, either it was a 1/20 situation from the first night, or the Red cult doesn't have an apprendice
So Castiel should not be a lynch target today, even if we happen to discover that he was converted