It's true that some people have a huge amount of negative emotion when they come to terms with the fact that there is no afterlife or celestial deity, especially when they've either been brought up in it, have devout family members, or have devoted a portion of their life to it. Would you expect some people not to be depressed over this realization?
However, it's not true of everyone.
Without belief in eternal life, nothing on this earth makes sense.
What 'makes sense' to you might not make sense to other people. There are countless different ways of looking at the world; yours just happens to be one of many.
A lot of people find the world makes a lot of sense once you come to realization that the universe doesn't revolve around you or any other person, and that there is no divine plan.
Even the Archbishop of Canterbury had a crisis of faith after the tsunami disaster. To a non-believer, the tsunami disaster makes perfect sense; we live on a planet with constant earthquakes that sometimes cause many deaths. There's no mystery to it, and it makes perfect sense in the world we inhabit.
“A lot of people find the world makes a lot of sense once you come to realization that the universe doesn’t revolve around you or any other person, and that there is no divine plan.”
Ah, but the whole point of the Christian life is to come to that realisation that “the universe doesn’t revolve around you”. There’s an old saw that at the center of SIN is “I”. That’s not a bad definition either. Sin is when you see yourself as all that is important, and other people are just objects that exist in your reality. Realising that and at the same time accepting that there is a divine plan is in no way contradictory. After all, to fully understand such a divine plan one would have to BE divine.