When you admit to holding no personal god, people don't want you to mention your atheism. You are expected to remain silent when someone wants to pray at a dinner table, to submit to whatever God the person worships out of respect for their beliefs. But the favour is not returned, as folks will often want to stop your meal at your house for some hand-holding ceremony. Under no circumstances are you to challenge their belief or even mention your lack of belief.
Should it come out that you are an atheist, you are expected to answer questions, and lots of them. When people have been indoctrinated from birth, they are allowed to be offended by your atheism. The person will usually tell you some sort of miracle they have experienced, generally an illusion of a dead family member or deity. Sometimes the image is in the air, but may present itself in a fish stick. They present their faith as proof of the existence of their supernatural experience. Questioning the validity of their holy toast is seen as insensitive or blasphemy and the penalty will be a burning hellfire.
Believers will then present their holy book as evidence for the existence of God and ask if you have read it. Often times they will point out a passage relating to the fact that you are not permitted to question God. The individual is always of the opinion that an atheist will know nothing of the content of religious scriptures. Their knowledge that I am not only a heathen, but a gay heathen will often lead them to the passages that prohibit homosexuality that are contained in the pages of all of the Abrahamic faiths.
Now, I have read the Torah, Talmud, Midrash, Qu'ran, and several translations of the Christian Bible. I know that homosexuality is considered a dreadful sin. However, the eating of shellfish, shaving your head, refusing to marry your rapist, speaking without permission of your husband, marrying someone of another religion, and even looking at a menstruating woman are also similarly banned. Christians love when you mention that Muslims stone rape victims to death, but become very flustered when you mention that the origin of the punishment is rooted in Deuteronomy 22.They enjoy pointing out that Mohammed was a perverse, insatiable rapist; should you mention that this was also true of Moses, you will be asked to leave the room for fear of upsetting someone.
You see, a theist is allowed to use their book to vilify the atheist, but you're required to remain quiet while people try to force you to be "saved". The believer is permitted to pick and choose which rules they live by and also choose them for you. To me, this seems patently unfair and extremely hypocritical. If you have a question, I'll surely answer, but don't come into my home and try to pawn off a most poorly-written book of brutal fiction as fact.
"Question with boldness even the existence of a god; because if there be one he must approve of the homage of reason more than that of blindfolded fear."-Thomas Jefferson
Letting Go Of God Part One