Suicide rates are very high in the most secular, richest countries.
Those suicide rates have nothing to do with them being secular. Japan and Korea both compete for the top spot in the world. Japan is secular, Korea is very Christian. In both cases it is the neo-confusionist culture which drives people to suicide. It has nothing to do with a lack of belief in god(s). Scandinavia is plagued by cold, dark and depressing winters; once again, nothing to do with lack of belief in deities.