Hi Phat
Because my relationship with God is quite personal. This I know. Or I believe. I believe that I experienced a profound change when I got saved. I then think (or believe) but do not know that I can recognize God-morality better than I could before. I could be delusional, however
Many people experience a profound change when they join the military so I don't see that your experience is even unique to religion.
Edited by ts, : add quotes