Issue with God right now.

A friend of mine died yesterday on Thanksgiving after battling cancer, leaving a wife and two beautiful daughters. Everyone is offering their prayers and sympathy for the family. I know that he is up in heaven, has him and his family were very devout Christians. I think I’m suppose to be happy about this, but all I have is smoldering anger at God for taking a strong, wonderful individual from this Earth. This is probably because I only believe in God and don’t worship him, but I don’t understand and I am arrogant enough to want a better answer than “It’s part of God’s plan.”