MK27, as I said to another topic, I don't believe in a universal good or evil. In that sense I don't believe that there is a correct answer to the question what is good. Even if you give me the most evil act on earth, I will still not say that I believe that is evil, except in the sense that "that is evil for me". Implying that I as long as I am not doing it, there is not sense of being evil. As long as I am not killing somebody in cold blood, I don't really label it as evil, even if I call it that.
Practically, there might not be a difference on our point of views. If we still see something we consider evil we will still oppose it. If I say "that is evil" or "that is evil for me" makes a little difference on my actions. So you might agree that a murderer should go to jail because he did something evil, thus he has to be judged, I would say that the murderer has to go to jail because he cannot function in society. I won't feel that "justice" was served or that this is a sort of "punishment".
The reason of my belief has to do nothing with religion though. It just makes more sense to me, that is all. Most religious persons I have met, agree with you. That there is a universal good and evil. Even if they believe God is the one that decides what is good and evil. Believing in a universal good and evil is a positive think for me, even if I don't believe so. I won't tell my child "do you think stealing the cookie is a good thing? How do you feel about it", I will simply say "stealing the cookie is bad". Still, as said, if you truly believe something, you believe it, even though it might not serve you or the society.
Saying that "no one really believes that good and evil is subjective" you are saying that I don't really believe what I do. After everything I said that is the conclusion you have? I am sharing ideas I have thought, overly thought and overly questioned and doubted. What else could I have done on your opinion to find what I truly believe?
There is not always one correct answer in math. There can be two or infinite number on ones.
Saying that nobody really believes in God is a 100% wrong. To prove this, tell me anyone that has proven their belief in anything more than a person has proven his belief in his God. Doesn't matter if the believe is right or wrong. There are so many examples that can prove you wrong. I am truly suprised that you would think otherwise.