As an Atheist I'm pretty tired of being told what I believe, too. From the posts I can't tell, but I would kinda hope that your point about understanding also extends to Atheists rather than just against. I suspect you're not intending offense.
No, I was not intending to offend anyone. Many Atheists I know were taught BAD theology and then quote the bad theology that the were taught as if it were truth. Many christians were also taught bad theology and repeat it as if it were true. Many atheists were also taught good theology; but, simply do not believe the bible.
As for what Atheists believe, there are as many beliefs as there are people. I ask people what they believe or ask them questions (ergo my moniker). I have had many Atheists on this site come onto my threads, tell me that they are unbiased and then attempt to ask trick questions. I go back, look at their prior posts on other threads and it is apparent that have lied to me. I have also had many sincere Atheists and believers ask sincere questions and engage in meaningful conversations. If you doubt me, go back to my profile and read my posts.