The thing that frustrates me the most in discussions with religious people is the propensity for dragging out the same old accusations we've heard and debunked a thousand times. And I don't doubt they're tired of the same old arguments from our side. There must be a way for believers and non-believers to discuss their differences without malice or an attempt to proselytize. I know in my case I'm not trying to convert theists into atheists, but I do hope that by referencing logic and naturalistic explanations for religious beliefs I can get my point of view clearly understandable, even if it's not agreed to. In fact, discussing theism with believers helps me refine my own thoughts and arguments. For reference:
The musings of an ordained Stoic