It is good and bad, many people gling to their religion for something to offer them support in life when times get tough, whether it is all real or not is unknown (to me anyway), but with out religion many people would cease to exist today.

Then you have the negative side, more then half of the worlds wars since the commencements of civilised nations have been because of the difference of opinions in religions. These wars have claimed the lives of millions and millions of people.