Is there such a thing as objective morality? If so, what is it? If not, why not?
For something to be objective it must not be influenced by personal feelings or opinions when considering the evidence seen.
Morality is a system of principles about right and wrong.
I believe there definitely is objective morality.
The evidence is in
1. the existence of empathy and the fact that there is such a thing as a conscience. Without a conscience one cannot have empathy.
and
2. how that empathy/ conscience is destroyed when a person choses to become inhumane.
God made each conscious being / soul with love. Love is really a spiritual connectivity because it allows us to feel for others, to be aware of their status whether happy or sad, healthy or suffering. Empathy is based on this love. Those who are humane have empathy. That means that they feel for others and want to reach out and help them where they see the other in some danger or alleviate their suffering if possible. This is observable fact. There are countless cases to be seen where even a stranger may endanger their own life to help another person in need.
This condition of empathy can be destroyed.
I have been told, and I have also seen evidence myself, that a person who choses to become inhumane first destroys their conscience and that really entails destroying the spiritual connection with others, so they have no empathy. My late husband came out of the closet several years before he passed away and told me that he was inhumane or in his exact word "evil".
In answering some of my questions he revealed that to become inhumane a person must do harm to others, both animal and human in order to go through a process of, what he saw as, "development". He said at first one does harm and feels indifferent. But the person needs to continue to do harm until they get pleasure from seeing the pain and suffering of the other. Then, he said, the process is complete. And I have seen that once a person goes through this process and becomes inhumane there is no turning back. They have crossed an abyss from whence there is no return. I strongly suspect that this is creating a disconnect between them and others spiritually. So there is no more love. They only hate.
Thus having a conscience and empathy is evidence that there is objective morality