Religion, according to one definition is the sigh of the oppressed. Religion is basically a way to get out of the oppression. Thus Religion has to be joyless.
According to the story and the consequences Adam was made immortal and the tree of death (not knowledge) was forbidden. But the Deity of death deluded Eve and won in making Adam mortal and easily susceptible to the death. God being truth, lie is opposite and takes the form of death.
None. There are certain set of conditions, circumstances and privileges that make people considered to be fortunate. Being fortunate must be something else than being satiated and happy.