Ok, I'll take your word that there are such people. I live in a country where that sort of behaviour is lunatic fringe, and I've never encountered it myself.
Do you have to deal with them? If not, that's one possible approach: withdraw. This applies to real life as well as the Internet.
I know that several of my colleagues are Christians, and they may know that I'm an atheist, but it basically doesn't come up in conversation. I have no mission to convert any of them, and I'd only discuss it at all if someone else started the discussion.
You might try asking these mad people, "How many cats have I tortured? How many babies have I eaten?" by way of a reality check, and ask if they would be doing these things themselves if not for the fear of God. I'm echoing here this post from the Sequences. More generally, eliciting their reasons for their beliefs might be more effective than setting out your own as an opposing line of artillery.
Just an idea, which may or may not get anywhere. As I say, I've never had to deal with such people. But I am sure that coming at them with fear, anger, and resentment will never work. It never does.
BTW, these people call you evil, but do they act like they believe that (i.e. putting you in fear that they'll burn your house around you), or only as if they believe they believe that (i.e. they do nothing more than utter the words and keep their distance)?
ETA: I just remembered some context that I'd forgotten when I wrote the above. You were a Moslem, yes? Are the people you're talking about Moslems or Christians? Fundamentalist hicks or the sort of more enlightened Moslem that you were yourself, and have moved away from?
You might try asking these mad people, "How many cats have I tortured? How many babies have I eaten?" by way of a reality check, and ask if they would be doing these things themselves if not for the fear of God.
I've met a frightening number of people for whom the professed answer is "yes". Now, you know and I know that that's far more likely to be an applause light or a hasty assumption than an accurate gauge of future behavior, but that's hard to prove: naively it might seem that the lack of obvious atheist babyeating/cat-torturin...
I have noticed during my dialectic adventures on the Grid that religious people, no matter how "reasonable" (i.e. moderate, unaggressive, unassuming, gentle, etc.), would get very annoyed by an assertive, dry Atheist perspective, which they tend to nickname Hollywood Atheist (interestingly, religious people tend to use this term to atheists that openly make fun of religion and are very assertive and even preachy about their disbelief, while atheists tend to use it to mean people who are atheists for shallow, weak reasons and who do a poor job of defending their stance in an argument). There is also the tendency to compare the certainty of an Atheist with that of a Fundamentalists, when they are fundamentally different in nature (pun unintended), something they do not seem to be able or willing to grasp. Not that atheism hasn't had its fair share of fundamentalists, but that's supposedly the difference between an atheist who is so out of rationalism and one that is so because they hate the Church or because Stalin (glorified be his name) told them to.
On of the things that irritate them the most is the phrase "God is Dead". A phrase that is obviously meaningless in a literal sense (although, of course, God was never a living being in the first place, by the current definition). Figuratively, it means something akin to "Our Father is dead": we are now orphans, adults, we don't need a God to tell us what to do, or what to want, or how to see the world: we decide for ourselves, we see for ourselves, we are now free... but it does feel a bit lonely, and, for those who relied on their God or Parent Figure as a crutch, it can be hard to adapt to a world without a reference, without an authority figure. A world where you are the reference, you are responsible for your own moral choices.
There are other things, specific arguments, methods of approach, that anger them and are counterproductive to the submitting of the message. Of course, the atheist message is a Brown Note of sorts to the religious mind, since it challenges their entire worldview (though in the end it all adds up to normality... except much more seamlessly). However, it would be nice to develop an approach towards theists that avoids the frontal part of their mental shields and gets into the seams, using the minimal force in the points of maximum efficiency, bypassing their knee-jerk defences...
So, here is my question to you all: how do you get your points across to a theist without pushing any of their Berserk Buttons, without coming off as a condescending and dismissive jerk, and without having to shorten all of the freaking Inferential Distance?
Developing a general algorithm would help us spread our ideals further, which, as far as I know, we think will be to the benefit of all humanity and might in fact help us avoid extinction. So, suggestions...