Actually, I'm not. However, I don't think that anyone would go to a halal market for a pork roast, because they are aware that it is a halal market. On the other hand, a bakery with a name that does not indicate any particular set of beliefs may attract people who want non-denominational cakes.
I think the question is interesting because it would immediately reveal whether or not lesbian wedding cake purchasers are crusading or just want a cake. If they changed to a name that indicated their Christianity or even just put up a sign that indicated that and subsequently got more requests for sin-cakes, that would be a pretty clear indication that people are out crusading. If they got less requests, which is what I would expect, that would indicate that people are more likely to patronize bakeries that want their business, so long as they can tell before they walk through the door.