Personally I think all religious people are brainwashed idiots. Not just christians but all religions. If there was no religion there would be much less hatred in the world.
Because he was one of the most famous people in the world.
And because it came as a shock.
Farrah Fawcett had suffered a long illness and it was common knowledge that she would eventually die.
Nobody expected MJ to die.
It has nothing to do with religion.