I feel I should present my reasons, but they are somewhat long and off-topic for that discussion. I will therefore create a new thread here for them.I wrote:I'll lay my cards right on the table here. I believe that religion, especially afterlife-centric religion, is a net negative influence in society, and I believe that the world would probably be significantly better off if more people were atheist. I have reasons for believing this which I can lay out of you wish (in fact I think I'll make a seperate discussion for them), but the point is I don't want to just defend the right of atheism to exist, I want to see it spread.
Why I believe religion, especially afterlife-centered religions, are a net negative influence in society:
1: Religion promotes irrational thinking:
Religion is, at its core, a thing of complete irrationality. It asserts, in the absence of any evidence, that there are such things as gods, spirits, devils, mystical forces, or eternal souls. This pronouncement is based not on any rational attempt to understand the world but on (usually) some variation of appeal to authority or appeal to tradition. Islam, for instance, draws its credibility from the notion that the Qu'ran is the direct word of God: a textbook example of circular logic if there ever was one. The believer accepts religion because he believes these appeals to tradition or authority or because he subjective feels "faith"; in other words because he elevates what his emotions tell him over what his reason tells him. Religion provides its adherent with no framework for independent critical or rational thought. Indeed, the very idea is hostile to it, as the application of such thought to the religion's first principles will destroy the believer's faith. Instead the believer is encouraged to uncritically accept the judgments and values of the religion as (literally) gifts from the gods. Some religions do develop rich internal intellectual traditions, but even there those traditions are usually incestuous, focusing on better understanding the religion's pronouncements rather than critically evaluating them on an objective basis.
The main problem with this is that religion rarely confines its irrational pronouncements to metaphysics. Religions usually contain histories, cosmologies, moral codes, or some combination of the three. These things have practical relevance in the real world, and the pronouncements of religion on them are often very much at odds with what may be determined by reason. A good example is scientific theories on the origin of the universe and the evolution of life vs. Biblical literalist Creationism. Bluntly, religion frequently demands its adherents make real world decisions based on thinking 2+2=5 when 2+2 in fact makes 4.
The results of this are most distressing in the fields of morality. Religions almost always offer some sort of moral code, and this moral code, like the rest of the religion, takes its validity from appeal to authority or appeal to tradition and often contains objectively silly, arbitrary, or harmful rules. In some cases these rules may have served adaptive functions in their original context, but because religions are naturally resistant to change in their fundamental doctrines (they are, after all, all about appeals to authority and tradition), they continue long after they have outlived their usefulness and become harmful. Thus, religion creates a great deal of human suffering by inflicting upon its followers harmful rules that curtail their freedom and happiness for no rational reason. Worse, these rules are often presented as applicable to all humans, and so do not always stop with the followers of that particular religion. The Abrahamic prescriptions against homosexuality are a good example of such a harmful rule, which continue today to cause a great deal of totally unnecessary human suffering. The conviction of missionary religions that people of other faiths must be converted to theirs by any means necessary is another example of an aspect of religion that has created tremendous, totally unnecessary human suffering throughout history.
Religion devalues the good of humans
Religion frequently does not have the well-being of humans as its highest goal. The highest goal of many religions is the well-being or pleasure of the gods. For instance, in all the Abrahamic religions the highest goal is the service of God. When human happiness and well-being and the service of God conflicts, the service of God always wins. That is arguably the moral of the story of Abraham and Isaac; it was very important that Abraham prove that pleasing God was more important to him than the well-being of his own son.
By not making the well-being of humans its highest goal religion is inherently an ideology that more easily lends itself to abuse of humans. You can enact policies that harm people for no useful end, and all you have to do in order to justify them is claim that the gods desire them. For dramatical examples of this witness the religiously-inspired senseless human butchery of the Aztecs, or the continuing persecution of homosexuals by many religions today.
Afterlife religions can make you embrace death:
Here I move on from "religion" in general specifically to afterlife religions, which are especially harmful in several ways. The first is that they make the death of humans more palatable. Humans fear death because they fear the termination of their own existence. Millions of years of evolution have wired our brains this way. If you believe that the death of the body does not mean the end of the individual this fear is eliminated (or at least reduced). This is probably why afterlife religions are so popular in the first place: as soon as humans developed the cognitive capacity to understand that their physical death was inevitable that knowledge must have tormented many of them horribly, and belief in the afterlife would be an excellent coping mechanism; a means for these people to stay happy and sane by simply refusing to believe that the end of their body was the end of their existence as thinking beings. But this comforting belief has a dark side. It can provide a framework for justifying the killing of a person in the belief that their death is actually in their best interests, or that it does not truly cause their end.
The obvious example I could use is suicide bombers who go to blow themselves up fortified with the belief that they will earn their way to paradise. Would they be so willing to kill themselves if they believed it was the end of their existence? Some might indeed be so ideologically committed, so angry, or so hopeless that they would, but I suspect if we were to magically remove belief in the afterlife from humanity suicide bomber recruitment would probably suffer at least a little.
However, I think there are other examples that would serve even better to illustrate the unique madness of this belief, which is that it can make or enable people to commit utterly heinous acts for no good reason, all the while believing that they are doing good. A good example of this, I think, is parents who permit their children to die of preventable infections out of religious conviction. Some of these parents may indeed be truly horrible people, ghouls in mind if not in flesh, but the horrifying thing is I suspect many of them aren't. They weren't psychotics, sadists, or sociopaths. They didn't enjoy watching their child die in pain, in their hearts it horrified them as much as it would horrify us. But they stood by and watched their own children suffer and die because they thought that suffering would translate into kudos points in the other world. They believed that once their child expired from their soul would just go through the wormhole into Heaven; their pain was a temporary stage on the journey to the afterlife, mercifully relieved by death, rather than horror followed by nothing. The awful thing is that once you accept their irrational first principles their choice can actually appear rational: if you believe that there is an eternal afterlife waiting for you, and that your well-being in it is dependent on pleasing God, and that God is displeased by you using antibiotics, then allowing somebody to die of infection rather than treating becomes nothing more than an exercise in prioritizing the person's long-term good over their short-term good.
For another illustration, I'd point to Creepiest Death Rituals From Around the World. It's a humor site, but quite illustrative nevertheless. The two most horrifying practices listed there, Sutee and Buddhist Mummification, were both justified or inspired by this madness that I speak of.
Sutee was justified by the idea that spouses would be re-united after death. But I think Buddhist self-mummification is an even better example, because it wasn't something inflicted on frequently unwilling victims: the self-mummifiers did it to themselves, of their own free will.
You really have to read about it to appreciate the tragic farce it was. Self-mummification was a long process that includes several years in a special diet designed to change the body chemistry to allow the corpse to mummify more readily. After years preparing for your death ritual in this manner you'd drink a poisonous tea that causes explosive diarrhea and vomiting. Its purpose was to change the chemistry of your digestive system to stave off decay. Then you'd go to a small underground cubby where you'd be buried alive. This was done in the belief that to achieve enlightenment you must separate yourself from the physical world entirely so that at death, instead of being reborn, you become one with Buddha. Think about that for a minute. These men buried themselves alive in the belief that it would help them achieve enlightenment. And in all likelyhood all they got was a slow, painful end to their existence. The courage, dedication, and faith required for this act is astounding to me, and it was probably all just so they could screw themselves over horribly in the end. I can't think of anything that would better illustrate the tragedy of misguided belief in the afterlife in a universe where it probably does not exist.