Augustus might be overstating things to say that we can't evaluate benefits and costs at all, but I think otherwise there's a valid point here.
If there's a problem with the question, it has to do with evaluating "religion" as a concept first of all, although obviously the OP asks about organized religion, which is potentially an important qualifier. But, to make an analogy, imagine asking whether or not organized politics is a positive force in the world. You might be tempted first of all to wonder whether an alternative to organized politics (in the most general sense) is even possible. It's easy to imagine alternative political systems, or the world divided up into different states, but it's hard to imagine a world without politics because politics seems to flow from fundamental human characteristics that necessitate social organization and our dependency on cultural knowledge. Religion is similar (with possible distinctions of course, for example in being focused on ultimate meanings or discerning something fundamental about the structure of reality), and of course in many societies is never entirely separate from politics. It's also pretty easy to come up with a list of negatives associated with organized political behavior, and a lot of the negatives will actually look quite a bit like the social negatives associated with religion: the in-group/out-group dynamics, ideological dogmatism and intolerance, and etc.
On the other hand, if you replace "organized religion" with some list of traditional religions, with specific beliefs, institutions, and etc., and ask about them not just in general but whether they are a positive force in the world right now, then the argument seems a lot clearer. It eliminates the difficulty of considering augustus' last sentence about history. Maybe some traditional religions were relative forces for good at certain times, but less so now. In a sense, it feels like it has to do with the social forces that lead to them becoming "traditional" in the first place: the reification of dogma and the unwillingness to adapt to new information or embrace different ways of seeing the world. But it's not as clear to me that it's useful to generalize from recognizing a net negative effect in much of traditional religion to an idea that we should think of religion as something that could be eliminated, as is often done (I'm not accusing orbit of this). But only in the same way that it's not clear to me that we could eliminate either organized religion or politics as such. Mostly I think of it as a cultural struggle to adapt to a rapidly changing world.