Why are christians afraid to die?

An interesting article titled "Religious Belief Linked to Desire for Aggressive Treatment in Terminal Patients" was published in the New York times indicates that religious people seek death delaying treatments. 

It would seem to me that if I was religious and if I believed in some god that promises eternal life with him, I would look forward to the experience without actually accelerating the process like suicide. 

Religion will forever be a mystery to me.