Well actually, I'm so out of the habit of philosophical debate I might not be able to! All I really mean, is when talking as an atheist to a Christian, we're talking about a lot more than the existence of a creator. It's a particular creator that they have a different idea of to me. And when we talk about the existence of a creator, we then jump to a particular one and religious beliefs based around the Bible, and the question becomes too wide.
I don't think any theist arguments conclusively prove the existence of god, far far from it, it I also don't think there is proof of an absence of god. I think scientific knowledge has an alternative creation narrative, and doesn't even investigate the question of god, which is exactly as I like it, as I think god is philosophy and should stay there.
I think that a lot of the time we take the approach that because, say, Aquinas' 5 ways offer no conclusive proof, that that proves non-existence, or that they are logically inconsistent throughout, which I don't agree with. I would say that is similar to saying that not being able to prove someone guilty confirms their innocence.
As an atheist I agree with their answer, just not their working.
However, while I find all this very interesting, it's probably not very helpful to your initial question. As I said upthread, I'm a vegetarian for moral reasons, but can't imagine ever saying 'what can you expect, he eats meat' about anyone. I don't think religious beliefs are any more valid than my secular ones, so I dare say I hold my beliefs as sacred as your friend does so the comparison is valid for me.