First of all, you are conflating non-belief with political liberalism. There are many liberals who are believers, and some atheists who are conservatives. And why should we NOT quote the OT?
Is it not part of your Holy Bible? Is God not eternal and unchanging? Is the Bible not the perfect inspired Word of God?
Do not Christians constantly refer to the Ten Commandments, which are in the OT, and strive to get them plastered all over government buildings? Do Christians not try to get Creationism taught in the schools, which is dependent on the OT book of Genesis? Did Jesus not say that he was there to fulfill the law, not overturn it?
Did he not say the old laws still applied? And is God's morality not claimed to be objective and perfect by his modern followers? Does he change his mind?
Is God a waffler? You cannot just use the OT at your convenience, and then expect critics of religion to just ignore it. It is still part of your holy book, part of your religion, and impacts us all in the real world when politicians invoke it on a daily basis.
If Christians don't like the OT now, why not jettison it? Finally, there is also plenty to criticize in the NT also--but that's the subject for another question. Hope this helps.
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.