So, 75% of the world's population is religious, believes in a higher power. How can they all be wrong?
In the early 1600s, a great deal of controversy surrounded one particular astronomer. For thousands of years, it was believed that the earth was the center of the universe, that the earth did not move, based, relatively recently, upon certain bible verses such as Psalms 93:1, Psalms 104:5, and Ecclesiastes 1:5.
This was the official position of the Church. Much scientific evidence of the time also seemed to support the geocentric view. However, we know very well now, the geocentric view of our universe was incorrect. Copernicus published a book suggesting the quite heretical idea that the earth revolved around the sun. He was so fearful of being charged with heresy, by the Church, that he waited until he was on his death bed before publishing the book. Galileo took up this torch and was very nearly charged with heresy until he recanted.
Was the majority of the world wrong? This would seem to be the case.
It has been postulated (and I apologize for not being able to source this at the moment) that at any point in time, 90% of what our species believes to be true about our universe is incorrect.
Now, does that mean I personally believe that people who believe in a higher power(s) are patently wrong about everything? Well, certainly not. What I'm suggesting is that we are all living our lives based upon our best guesses; that Truth is an illusion; that very little, if anything is a certainty, no matter what side of any argument you stand upon.
Just because a majority of people believe something to be true does not necessarily make it so.
(In philosophy, this is a logical fallacy, argumentum ad populum, "appeal to the people". http://en.wikipedia.org/wiki/Argumentum_ad_populum. We should all take classes on logic and philosophy, critical thinking, myself included.)