Do you think humans have a coelom? why or why not?

Yes, humans hve a true coelom (that is, we are euceolomate organism). It is between the layer of tissue that lines the abdominal body cavity (the parietal peritoneum) and the layer of tissue that covers the abdominal organs (the visceral peritoneum). In between is a slippery layer of serous fluid that allows the organs to slip around without friction. 

yes they have coelom mean cavity so they are called eucoelomates..

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.