One person suggested the forum was a propaganda exercise for demolishing the building.
Civic Trust Chair Neil Roberts thinks the church already has its eyes set on the cheaper, contemporary option.
"I really do think that the church has got its mind made up.
"It already knows what it's going to do. Because they'll go for the cheapest option, they won't spend the money on the two other options."
Neil Roberts claims last night's forum was a political exercise to make people in favour of the new, contemporary option.
While some at the forum were happy with proceedings, others felt the presentations should have been more balanced.
One woman said: "Obviously some people had things they wanted to know and wanted to think about, and I think it was a good vehicle to do that."
Another said: "The discussion was not sufficiently open really. You only had a certain group of people representing a certain viewpoint."