Tom, that's the thing. Guilds weren't really that major for noblility during the middle ages. They were typically for commoners. Many were or became well-to-do commoners, but still tended to not be nobility. Though I will admit that many of us use them for other purposes where the game does not quite give us easy sway otherwise (alliances, religious knightly orders, etc).
Religion though? That was a major part of everyone's everyday life. Being a leader of the stonecutters' guild? Not usually concerning unless you'd have to deal with them for some reason. Religious leaders? I'm pretty sure even the pagan tribes of Germany tended to know who the nearby Bishops were. They might not have liked them, they may have even HATED them, but they knew who they were.
