As an atheist, you hear about theists writing that atheists actually do believe in (their) God, but just hate him and love to sin. You hear about this, but every time you actually see it, you can't help but to blink a few times to make sure your eyes didn't fool you. It is just too damn irrational.
To any theist who will come across this blog post, there are a two things you should know. Let's begin by explaining what atheism actually is, as many seem to be rather confused. I've already done this multiple times, in blog posts like "Killed because of atheism?" Atheism isn't a belief or ideology with doctrine or dogma. Atheists aren't a group of people with anything real in common. Atheism is ONLY the disbelief in gods and atheists are disbelievers in gods, nothing more.
To state it in a nice and concise way: Atheism isn't a belief you acquire; it is the state of disbelief you are in when all theistic beliefs have been subtracted (or if they were never added in the first place).
The second thing I should write is that atheists don't "love to sin". Well, I guess that depends on how we define "sin". If we define it as "morality", or in other words as acting in a way that is immoral, then atheists don't love to sin. But all religions, cultures, and even individuals have varied views on what is moral and immoral, and religions don't seldom have a very antiquated and quite illogical view of morality.
More to the point, atheists don't disbelieve in God because they "love to sin" and don't want to follow God's rules; atheists disbelieve in God because that's what's rational. It has nothing to do with morality or personal desires, but rather rationality, evidence, and common sense. Either one must believe no unfounded claims, or all of them.
If, however, it is sinful to be for LGBT rights, or be sexually active or masturbate (not that all atheists even are sexually active), or eat bacon, or abort cells without thought or feeling, or question religions, then many atheists don't "love to sin", but oppose these arbitrary, bigoted, and stupid views of morality, even though that's not the reason why they are atheists. There's also plenty of disagreement amongst theists about what is moral and what isn't, so why is it so special and sinister when atheists disagree?
I suppose it's a sin to oppose religious law, have your own opinions, or question, though, so perhaps atheists do love to sin. At least from the perspective of a theist still living with a mindset hundreds of years old.
Update, January 14, 2015
A theist responded to this blog post on my Facebook page on January 13, complaining about how I called theists irrational (by saying atheists disbelieve because that's what's rational); she used arguments like the Bible having made predictions, so that's not irrational at all. Read my rebuttal here, in "Irrational religion".
In the meme below is a very brief conversation between another atheist and myself, as comments on my Facebook page, below a link to this blog post, on January 14.