Coincidentally, the Atheist Society at my university are hosting an open debate on this question on the 30th, with Richard Harries (former Anglican bishop of Oxford) debating with humanist Julian Baggini. They have invited all the Christian societies on campus as well.
It is one of these questions which can turn people away from religion quite easily (which, I think, is the reason why the Atheist Soc. are organising a debate on it) because it is very simple to paint a picture of the killing that has gone on over the centuries and in the Bible. It breaks my heart, because in British society people have become very secularised because they are not prepared to look beyond the shallow arguments of atheists. I see two groups - one group who enjoys the way they can employ such simple arguments to rebel against the “establishment”, the other group being afraid of being challenged by such people.
I think that to be properly prepared for this Christians need to face up to the fact that there have been atrocities carried out in the name of religion. History is full of atrocities, but those committed by Christians stand out because people expect the Church to be a museum of saints. As somebody said somewhere else on this forum, the Church is not a museum of saints, but a hospital for sinners. Also, the concept of “good” which these people judge us by actually comes from the major religions. It is my view that Western law and ethics were fundamentally built on the biblical commandments. Considering the values of the Druids, the pagan era of the Anglo Saxons, the Vikings, the Huns, the Mongol hordes of Genghis Khan, the Goths etc. I would say that Judaism, Christianity etc. has shaped the values of the world for the better. Even now in the dawning of secularisation we are seeing family life deteriorating, we are seeing increasing abortion, teenage pregnancy, crime, STIs, and any number of other social problems.
I think the danger lies in getting hung up on these simplistic arguments and not looking into them deeply enough. I got caught in that trap, and it took a lot of effort to climb out.
God Bless.