We can win with any faction so long as we're both still alive. If the mafia had killed enough townies to win, we would have won also. The same thing if the Cult wins. We've chosen to throw our goals in with the town because the town has the numbers.
Wait
I like this idea better. While you guys worry about a cult, tonight I'll kill Necron. Way to be an epic jerk, jerk
But you know what, lynch me. Just lynch me. Then tomorrow, when the game is still going, you can try and lynch a cultist. If you're lucky, you'll get one! Too bad the leader can then recruit another one of you innocent little townies. Tying all the cultists together and then systematically lynching and night killing them is the only way I see any of us winning this stupid thing.