20-30 years may be a bit too soon IMO. But yes I do agree that religion will probably stop excisting not so long from now. I didnt really state this in the other post but I was talking about what if religion has never excisted in the first place. The world would be totally different, more so than we can propably imagine.

I think religion has been and will continue to be just a step in human history, but like you said, then we grow up, or rather, move on. We start to think more for ourselfes which is encouraged in most societies today. However, there's still loads of countries in where this is not the case, but I believe time and patience will fix that just like it did with western countries.