I haven't read that forum, but "[somebody] on why we should abandon religion" doesn't sound like a very catchy title on an atheist forum. If I saw it, it probably wouldn't grab my notice. "Oh, I already know why we should abandon religion, I wouldn't be reading this forum if I didn't, now would I?" would be the unconscious evaluation, and by then my eyes would have moved to the title of the next topic already.

In general, I'd say that "[person] on [subject]" is only a good topic if you know that your subject audience already knows who the person is, otherwise it provides no information. Eliezer's certainly well-known among the transhumanist/singularitarian crowd, but among the general atheist crowd? I doubt it.