The amount of charity work performed or not performed by Jehovah Witnesses, Mormons, Catholics, Protestants, Muslims, Jews, Hindus, Buddhists, Wiccans, Atheists, etc...
has zero bearing on whether or not their claims are true. The proof is in the evidence.
Whose god actually shows up in the real world consistent with the claims of its followers?
Jehovah sure doesn't.
http://en.wikipedia.org/wiki/Criticism_of_Jehovah%27s_Witnesses#Failed_predictions
EDIT:
"Often our brothers and sisters who have lost loved ones and homes, go around sharing the wonderful hope we all have and giving answers to: why is this happening? Is it God's Doing etc? In fact, a fantastic opportunity to share the wonderful hope."
SHAME ON YOU!
It's a fantastic opportunity to have access to a whole lot of extremely poor, traumatized, emotionally vulnerable people who are more likely to uncritically accept ANYTHING that sounds even slightly positive and hopeful whether or not it's actually true; because they just watched their entire family get pulverized when their house collapsed in an earthquake, they haven't had anything to eat or clean water to drink for a few days, and may or may not be injured physically and/or mentally from all the stumbling through the ruins of their community surrounded by the rapidly-decomposing corpses of their families, friends, and neighbors.
You're not helping them because they're fellow human beings who are suffering horribly and it's the right thing to do, You're not helping them because you'd want somebody to do the same for you NO MATTER WHAT you believed or didn't believe.
You're helping them because it's a "fantastic opportunity" to make more Jehovah Witnesses.
Shame on you and everybody else who takes advantage of human pain for their own ends.