Christianity became the "state religion" of the Roman Empire in the third century AD when the Emperor Constantine converted to Christianity. A related question would be, "How did becoming the official Roman religion influence Christianity? " There were many pagan priests and temples, and not wanting to throw all of these out of a job, Constantine had all of them now become Christian priests, and the temples Christian churches.
Even art was converted: portraits of pagan godesses holding babies were now Mary holding baby Jesus. Christianity before this had operated out of private homes, so all this was quite a change. This inevitably watered down a faith which before was voluntary, and one had to buck the system a bit to be a Christian.
But it also introduced Christian ideas to a wider audience. The teachings of Jesus really are a radical departure from the power based culture of the ancient world. The values of humility, self denial and care for the weak for everyone, even the powerful of society, I think influenced the Roman Empire for the better.
Not long after Constantine, Patrick of Ireland would be the first person recorded to state that slavery is morally wrong. S argument was entirely based on Christian values: Christ died for everyone, slavery causes individuals who Christ sacrificed and therefore Christian society should end the practise. Slavery continued because too manu people profited by it, but for someone to have the value of ending slavery was radical.
Well, I do have alot to say about it, maybe I should make a hub :).
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.