If all humans decide to jump at the same time, we will definitely make some impacts on the Earth. Before we can do this, that means all humans would have already gathered in one place so that our impact can be felt. And so that we could all jump at once; at the same time.
This scenario has been investigated and there are so many things we should expect if we decide to do this. While it is true that we would release a lot of energy, some of this energy would be felt by us. The rest of the energy would spread into the air.
This shows that we would not make so much impact on the Earth, because that would create a net force of zero on the Earth. However, we would definitely create a huge sound (the loudest sound to be heard on Earth). We would also make the ground shake. However, this could create some natural phenomena like tsunamis or earthquakes depending on where everybody would gather.