According to the Christian religion, most people are NOT good. ALL people are sinful to the degree that only because God is incredibly merciful will the poor wretches be admitted to heaven.
This whole discussion started off with the question , "Will banners and skywriting on July 4th convince an appreciable number of people to admit they are Atheists?", and as I said, I do not think so.
I don't think that there is any competition between atheists and believers. The Atheists that wish to advertise Atheism with airplane signs seem to believe otherwise, but I do not.
We will always have religions and religious people, just as we will have nonbelievers and non religious people and agnostics. The percentages may change over the years, but no group will ever reach even 90%.
As for charity, whether to donate or not is a personal, not a group, decision.