Define your view of ' done a lot of good for the world' because there's an awful lot of bad stuff been done by devout Christians either in the name of Christianity or not.
Are Christians automatically kind generous helpful people and atheists incapable of being friendly, helpful and doing charity work etc?
Why are Christian aid groups seemingly incapable of helping others unless they can use it as an opportunity to' spread the word' at the same time ?
The well known but now infamous Xmas shoebox collection where you can fill a box with items for children of certain ages ( baby up till teenage) and include not only small toys but things like toothbrushes & soap, hairbrush etc for children in places like Romania , you then wrap the box in Xmas paper & label it boy/ aged 6-10 or whatever is suitable for the contents
This has been defiled because all the boxes at the collection centres were discovered to have been unwrapped in order to add a load of religious pamphlets etc so behind all these Christian acts there's always a hidden agenda. My wife and daughter used to fill as many as 15 boxes every year and we actually caught them in the act of ripping the paper off our boxes and emptying the contents when we popped back with three more boxes from a friend.
When I asked them to explain why they had emptied our boxes they said it was normal practice to redistribute the items because some peoples boxes aren't as full as others. Then I saw the piles of pamphlets & crucifixes
Needless to after a large number of complaints organisations like the Lions have now offered to collect the boxes and guarantee they won't be tampered with.