re: I wonder if this what Jesus could do....
Every miracle that Jesus performed could have been done with molecular control.
To turn one fish into many, just take atoms from the ground and arrange them like the atoms in the fish. He would have an atomic map of the first fish- knowledge of where every atom is and what type of atom that they are.
To bring a dead person back, arrange all their atoms the way they were before they died.
But then, there is no reason why God (since he created the matter in our universe, and the laws that govern it) could not only see the atomic maps of all things, but manipulate matter on the level of the atom.
I think this is the ultimate power you can have in this universe.