S-P posts some of the most insightful thoughts on this subject, here.
A Christian's life may or may not be as moral or healthy or happy or even "blessed" as the atheist's. Evangelism based on God "one upping" lifestyles that lack irony, tragedy and poverty is doomed to attract only the deluded and desperate and can only end in either deeper delusion and ultimately in despondency. The Christian Gospel requires a life of self restraint, sanctity and love for one's neighbor, but the Gospel does not claim that any of it is a talisman against the cosmic assault on our bodies and souls. The Christian is not called to overcome life, but himself. He is not called to live long and prosper, but to live well and be content in any state. He is not called to have a nice day, but as the Psalmist says, to offer up all days wherein we saw evil to God with thanksgiving. And in the end the Gospel points us to consider the randomness of life and the ultimate injustice: death.