what led you to offer a suggestion in the area about which you know practically nothing? ... You probably wouldn't offer advice on how all the surgeons in the world should operate, so why did you take it upon yourself to suggest changing religions for a billion people?

I thought that saying "perhaps someone who knows more ... could tell whether ... might be a way to ..." was a sufficient disclaimer.

If I had an idea about how all the surgeons in the world might operate better (e.g. trying tools from materials with different physical properties, having other surgeons watch the operation on video in real time and offer advice when asked by the main surgeon, etc.), yeah, I might ask in the same way whether someone had thought about it.