I find that a lot of Christians tend to be obstinate in their belief; they either want to hear none of it or stick by their one basic argument, which is, when you boil down to it: 'You're wrong.' The few who are willing to engage in intellectual discussion are, while open-minded, probably not going to be persuaded to give up their beliefs. If you want to debate with a Christian, choose your opponent wisely (AKA someone who will not be too sensitive), but don't expect them to be convinced by what you have to say. I'm speaking from personal experience, and, I do find, you end up going in rather tedious circles.
It can be rather frustrating.
It can be rather frustrating.