Yes a human expert who is devoted to uncovering and communicating truth will do much better than an llm. But that is not what most of the content in the world consists of.
Most content is written by people with questionable expertise who write with goals like fame or viewership numbers or advertising dollars. Most content on the internet or in the world does not seem to be written with the goal of uncovering truth.
To create a more truthful world AI doesn't have to be as accurate as an expert. It just has to be more accurate than average. And in many areas, that's a very low bar.
To choose a less controversial area than religion, I think adding AI to nutrition advice on the internet will be an improvement. It's true you will inevitably get inaccurate advice communicated with confidence, but any AI trained on any kind of credible scholarship for will still be miles ahead of Internet nutritional advice that is often filled with zany pseudoscience.
Yes it will produce inaccurate results but on average the information will be more accurate than what already exists and what is currently being perpetuated