hmm, if one of the most technology advanced country is filled with mostly atheists, does that say something about religion holding back?
Today, about 2.3% of the world's population describes itself as atheist, while a further 11.9% is described as nonreligious. Between 64% and 65% of Japanese are atheists, agnostics, or do not believe in God.
As paroxysm just pointed out, religion doesn't have much to do with their technological superiority. They just have a very fucked up culture and way of life (and that's what helped them achieve their success and also what causes all the suicides).