I'd note that the "and I've looked at other religions, and for that matter your own religion, more than you have" is a bit of a mistake. While a lot of Atheists tend to study religions for various reasons, there are just as many who are no better versed in religious history or philosophy than any other person on the street.

The core "may be convinced" vs "skeptical" issue though is something I would agree with as the fundamental difference between the two, if we're creating a intellectually valid split.