It's a little difficult to close questions as off-topic in a private beta—when the site's scope isn't fully defined—because it might be on-topic on a site that doesn't currently exist.
Instead, we should be thinking about whether, ignoring any other site or potential site, it's something we want to have here. If it is, it should stay open. If it isn't, it should be closed.
Once that decision's been made, we can think about where it might fit: if it's a really good fit somewhere else, it could be migrated at some point in the future. If it isn't, or the potential site doesn't make it into beta, it can just stay closed as off-topic.
The important thing is to think about this site first, other sites second.
Given how many other questions about Biblical interpretations have been answered here, this question looks to be on-topic so it shouldn't be closed just because there's a Biblical Hermeneutics proposal.
In general, unless Christianity.SE fails, I think Biblical Hermeneutics is going to have a little bit of trouble carving out a specific site scope.