The Internet didn't make us smarter. Or even the WWW as you are suggesting with your Google example. They just allowed us to find things faster. Before the web you would say "look it up in an encyclopedia" or "look it up in a book." Yes it took longer but still took all of the same skills so computers have not made us smarter.
What computers have given us is the possibility to be more knowledgeable if we use it wisely. Examples of not using it wisely would include following the Kardashians on Twitter or keeping up with 500 people we don't know on Facebook but call our best friends. Yes, there may be some entertainment value in there but I feel sorry for people for whom that is their sole source of new knowledge.
I have little doubt that if you took an infant from a thousand or two thousand years ago and raised them identically to someone born today that you could not tell the difference. Obviously if you brought someone older there would be a huge culture shock to manage. Look at how people have changed behaviour in the past when new technologies have caused disruptions. Are there huge differences between us and a person from even a hundred years ago, especially in the fields of math, science, and medicine. But do you really think that those people would have been incapable to understanding such concepts?
What makes everyone so sure that having knowledge is going to make people smarter? And for that who's definition of smarter? We know that in countries in which the women become better educated and have better control of their lives the number of children they have goes down. Part of that is having access to birth control which the Catholic church refuses to let people use. Here we have two groups with opposing viewpoints both claiming to have the smarter option.