What I'd really like to see someone post a link to a logically flawed (strawman, begging the question) article arguing that theists can't be good citizens on a Christian or Muslim forum. For good measure, throw in the fact that the author has demonstrably incorrect assumptions about theists. What kind of responses do you think they'd get from these particular "good citizens"?
As for me, I am a law-abiding, middle-aged, middle-class, minivan-driving, cookie-baking, sweater-knitting stay-at-home suburban mom who's been faithfully married to the same man for 17 years. I pay my taxes (no fudging!), vote, donate to charity, maintain my property, help my neighbors, patronize local merchants, treat others with respect, and raise my child with love, encouragement, education, discipline, and humanist values that are not derived from any religion.
I am an atheist. I am also a good citizen. The two are not mutually exclusive.