I'm an Atheist, I Have a Unicorn in the Garage

The only time it can be irresponsible is if somebody's trying to pull a bit of a slight of hand in a debate and trying to imply by calling themselves an atheist that they believe there is no God, but actually doesn't think that. In the context of a debate, we need to define our terms carefully. I'm debating is Christianity true? I need you to tell me precisely what is Christianity? What's the vision conditions of Christianity? If I'm out for dinner with you and you say, yeah, I'm a Christian actually, I'll go, cool. And that's it. Like who cares? It's just so uninteresting to me.