What's Opposite Of Humanity?

Humanity refers to the human race, human nature and condition. It is often referred to compassion and feeling for the well-being of others. When people pay charities and feed the poor, they are doing it out of the will to help the humanity. They can also be shown to have a lot of humanity in them. People like Mother Teresa often come to mind when talking of humanity.
However, people may not be as compassionate towards their fellow men and may be inconsiderate to the others' needs and feelings. These people are cruel or inhumane. So, the opposite or antonym of the word humanity is cruelty or inhumanity.
Hope this helps!

In my opinion, theism. I say this because in most theistic religions man is taken out of the equation or, at best, minimized.