The world would be at peace......provided that they could agree on what exactly Jesus taught. But they can't.What if every single person on this planet believed in and lived the teachings of Jesus Christ?
Were such a thing remotely possible, in my opinion, people would be so different than they are that it is impossible to say. There is an aspect to contrafactual reasoning that makes it hazardous: a small contrafactual (what would have happened if I had flipped tails instead of heads) is an instructive excercise. A large contrafactual (What would the world be like if we were all intelligent aphids?...or even merely intelligent? ) simply can't be readily evaluated.Would our world be better off or worse off from your view, and why?