Even if you don't believe in the the Bible, the story of Jesus is still pretty amazing and provides life enriching lessons. It is also highly relateable and relevant in a modern day world.
You have this guy who just wants to help people. He goes out in the word healing the sick and performing miracles, yet people still persecute him and seek to destroy him. You probably have experienced this in your life. I know I have.
We all have been in situations where we do the right thing, offer our love,share what is in our hearts, and people still lash out at us with judgement, disdain, and ill will.
Before Jesus was about to be nailed to a cross and killed, his enemies take his clothes and start casting lots for them(make bets I believe), he says a short prayer, "Forgive them for they know not what they do" (Bible: Luke 23:34).
As Jesus knew, sometimes people are so caught up in their own stuff that they don't have the ability to see clearly. He understood that they did not see the big picture and that they were blinded by their own minds/egos.
The same is true for all those that persecute us as well. Their egos are telling stories that they are choosing to believe that have no bearing in the truth you are speaking and living. As Jesus did, we have to forgive them and do the right thing anyway.