You know, I believe that
conscience is the best religion ever.
If you don't have it, you have no god inside you. Simple

I understand that. Though I'm not actually asking about religion. How do you come up with your conscience? Some atheists say that knowing what's good or bad can be a product of evolution and that it's imprinted already in the genes. Theists say that God is the basis of what's good, so by that you also get a definition for what's not good. Some philosophers say that it's a product of time and it's by instinct.
I just wanna what people's thoughts are about this. Where does your definition of morality come from?