*All* the world's problems? No, it would take some doing for a reasonable person to insist that *all* the world's problems were caused by religion. But there's a fair old chunk of them attributable to religious extremists throughout the ages. Particularly at the moment, religion is a major factor in war. Not the people who have faith, as part of their normal harmless everyday lives - but the actual extremists, the ones who are consumed by it, who think that by having wars they are doing what God wants, or who want everyone else in the whole world to believe what they do because anything else simply must be wrong (people with different beliefs being termed "heathens" or "infidels" and considered to be lesser human beings). The ones who think it is God's purpose for them to cleanse the Earth of whichever groups. The ones who take it Way Too Far.