[i]A Christian, on the other hand, can say - "Christ taught me to sacrifice my life for others, so I go to war".[/i]
Which another Christian can take as God acting his will through man.
An atheist will most likely take that as "When (a Christian) does a good deed he does it because he knows from some source that is good."
The point is that Christianity teaches what is good and atheism teaches that a certain thing does not exist.