That is the beauty of religion in the first place, i think. It is beyond your faith, logic and understanding. It is one thing that makes you believe in future, gives you hope and keeps you going even in the bad phases of your life. And yes, there are people who have prayed when they realized they had cancer and have been healed. I am sure there are lots of stories like that. However, my faith is still very small and infant and so i tend to logic more. But i would say religion is a journey and you will learn more about God as you grow, experience different obstacles in life and learn more. Faith is something we all exercise when nothing else works again. God has given us the mind to think and logic and so it makes sense to take aspirin when you have headache but then when you are strike with incurable cancer, then we tend to shout to God. Also, I am so thankful that my God forgives me, otherwise where would i go? i mean i have done so much sin and mistakes in my life that no punishment can ever make it right. But then i will have to face the consequenses of those mistakes myself. That is the rule of our life again. These things are very complicated to explain to people like you so i would say it is an experience. I do not want to complicate things here.