Last month when I was visiting my family we got into a conversation about what gives our lives purpose. I mentioned to my mother and sister that helping rid the world of religion gives my life purpose, and my sister, who is not religious in a traditional sense but very spiritual, shot back and said that there is a lot of good in religion. I agreed with her that all religions have some good in them but that the metaphysical beliefs that justify the good things in religion, also justify the bad things in religion, and I came up with what I call the religion-table analogy to try and explain it a bit better.
It works like this. A table is held up by its legs. On the table you can have good things and bad things, like, say, healthy food, and poisonous food. That represents the good of religion and the bad. The legs represent the metaphysical beliefs of religion that support all of its claims. The same metaphysical arguments that liberal Christians like former president Jimmy Carter can use to justify the truth of his god, are also used by the members of ISIS, Al Qaeda, Boko Haram, the Westboro Baptist Church, the KKK, and many others, to justify their god and their bad theology. Moderate and liberal theism provides cover for conservative and fundamentalist theism. Instead of just criticizing the fundamentalists, I'm focusing on refuting the metaphysical claims of religion altogether because chopping off the legs of the table takes down everything having to do with the religion. Keeping the legs of the table intact will always allow for the extremist to metaphysically justify their claims. Furthermore, anything good from religion can be justified without it. No one needs to believe Jesus was divine in order to see that helping the poor is good. No one needs to believe Mohammad spoke to the angel Gabriel to see that there is something wrong with charging excessive interest. But many of the bad things that religions have can only be justified with religion. ISIS' despicable theology of rape for example, cannot be justified without a belief in god.
And that's why religion has to go—all of it. I can't tell you how many times I've been in a debate with a hardcore religious fundie and they've tried to trot out the cosmological argument, or the moral argument, in an attempt to justify and lend intellectual credit to their extremist and absurd ideas. Destroy the legs of the religion table, and you destroy all of religion. This is not to say that I believe religion should be refuted because it can do bad things. I primarily believe religion should be refuted because they're all false. But to be responsible, you cannot just stop there. Since religions provide for many comforts in the lives of people, like giving them a sense of meaning, purpose, morality, community, and so forth, religion needs to be replaced with secular alternatives. When this is done, there is little to no difference in the ethical behavior and well-being of an atheist over a theist. And the lives of hundreds of millions of atheists around the world can attest to that.