Who told you that the world should be free from suffering?
Jehovah's Witnesses taught me that. They taught me that all suffering started with the original sin and someday we would all be free from it. They taught me that human imperfection, Satan, our lack of a direct relationship to God, etc. were to blame.
Now, I know better. As an atheist, I now know that there is suffering comes from a variety of sources; from an impersonal nature (e.g. earthquakes, hurricanes, diseases), bad people (e.g. selfishness, greed), bad circumstances (e.g. car accidents), bad decisions, etc.
As an atheist, I hold to the idea that if we really want to make the world "free from suffering" it will be up to the human species to do so. This would take a lot of work and a lot of time and a lot of resources. We make progress and sometimes we take three steps forward and two steps back. And, ultimately some problems may not be solvable. Regardless, I have no illusion that addressing suffering will be taken care of by anyone but us.