Switch the unhappy ones to mormons, they should be okay with the sharing thing.
I believe that it is because they are of different faiths and will always have opposite views....Your buddhist girlfriend have done the wise and smart thing by keeping the peace and not discuss religion of any sort because she knows that it will create confusion....The other two should follow her lead.:).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.