It is easy to prove EVIL in this world just look at the hearts of men and their evil deeds guided by Satan. If you are referencing religious deaths in the Crusades, read your history, The Crusades were instituted to stop the spread of Islam into Europe which had spread there for over 700 years unchecked. I feel sorry for all that cannot or choose to not see the daily miracles of beauty around us and the forgiving nature of God, for He surely does exist. Your life will go on spiritually empty and you will die like everyone else and you will be raised into eternity and there judged by God and if you believe you will have everlasting life and if you do not you will recieve everlasting separation from God.It's a very simple choice, one that you must ask yourself. Do I want to live in sin or be forgiven of my sins and live a life worthy of eternity.A life lived close to Jesus, what could be the down side, nothing unless you think that you are the God.