Is not the manner of slaughtering animals in Islam inhuman?

The Islamic manner of slaughter, namely cutting the animal's throat and esophagus with a sharp knife, is much more merciful than the electric shock and strangulation that cause the animal to suffer. Once the blood stops flowing to the brain, the animal feels no pain. As for the shaking of the animal at the time of its slaughter, it is not caused by pain; rather, it is caused by the rapid blood flow that facilitates the process of getting all the blood out unlike other methods that block the blood inside the animal body causing harm to those who eat its meat.