The only real way to stop it in Afghanistan is to bring the Taliban back into the government in a democratic way. No one’s going to like that solution but historically its the only way it will work.
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As for your "atheists organizing against "this barbarity."" You need to understand that atheism is not a religion in the traditional sense. The only real organization is generally political/legal in nature. We don’t go to church or spend time obsessively studying Dawkins’ "The God Delusion." Also, contrary to what the religious people think, we generally don’t spend time trying to convert people, burn bibles, or forcibly stopping children from praying.

You need to get in touch with the activists in your anti-war movement.

Good Luck!
References :

"You are going to hear of wars and reports of wars; see that you are not terrified. For these things must take place, but the end is not yet."

These wars are not the result of God having any hand in them. Romans 2:11 says "For there is no partiality with God." He does not favor one nation over another .. contrary to common belief.

Put the blame where it rightfully belongs … with Satan. In 1John 5:19 it tells us "… the whole world is lying in the power of the wicked one."

These conditions are being allowed for a time. At the appointed time Jehovah God will act and end all wars.

You say religious people are doing nothing. Not so. Jehovah’s Witnesses are preaching the good news of God’s Kingdom in the entire earth. We put our faith in God’s government to end wars, not any earthly government.

Read the whole account at:
References :
Matthew 24:1-14