That's a ridiculous statement. Imagine 1000 average random people from one of the more scientifically advanced and secular Western societies of today (b/c science has caused secularization) today and 1000 people from Western Europe in 500 AD. Take them and all their loved ones (to control for emotional attachment) and transport them back or forward in time into each others lives. After spending 5 years there, give them the choice to return. Dollars to donuts almost all the people sent to pre-science society will want to return while few of those sent to modern society would. And that's not counting the large % of those sent back in time who wouldn't have survived the 5 years. 
In fact, we have a real version of this experiment in the form of today's societies that are scientifically advanced in terms of both tech and scientifically grounded beliefs vs. those that are not. Almost all migration of people is towards the more scientifically advanced societies. 
Sure, without science we couldn't have the power to impact the planet in major ways, in that includes negative ways. But other than nuclear holocaust, the realisitic negative effects would only take us back closer to the type of existence that most of humanity experienced pre-science. So, science so far has vastly improved existence on balance and even it's most likely negative effects will just be to undo some of those gains. 
And as for plagues and famine, they were routine events in human history. Our current situation is causing so much anxiety, b/c it is a situation that has been made so unfamiliar and uncommon to us, due to science.