There is a popular conception that if religion could be abolished a primary cause of conflict and war would go with it. Current belligerence in the name of Islam is often cited, or the historical religious wars of Christianity, still with current echoes, are raised.
This, though, ducks the issue, which is human culpability. It’s along the lines of the childish excuse, “He made me do it”, to blame another, in this case God, and so shirk taking responsibility. Religion can be used to recruit the blindly faithful to the flag, but so can nationalism or a political cause.
Religion can be very effective in this as it purports to transmit the actual will of God, when in reality it is very much a human construct. Religious traditions develop and consolidate over many generations and can appear to be the timeless commands of God.
For instance, during a recent radio interview concerning extreme temperatures in Pakistan, a Moslem woman explained the difficulty this posed during Ramadan. From sunrise to sunset fasting requires abstinence from drinking even water.
While this is an impressive display of personal disciple it nonetheless remains a human originated stricture. Religious scriptures can no doubt be quoted, but they, Koran, Bible or Talmud, are of human authorship.
Deists would point out that the created universe works according to identifiable laws, with inherent mechanisms. On a hot day, thirst is the natural trigger to drink and doing so is not a sin or breaking some divine ordinance. Not imbibing a glass of water is a human choice not a divine one.
Similarly, perpetrating violence comes from motivations that are all too human. Newsreel footage from the First World War exists of priests showering paraded troops with holy water from essentially a bucket with a broad paintbrush. However, there can be little doubt that that conflict arose from political and economic causes, not by celestial direction.
Frederick the Great described himself as a philosopher, which in the 18th century meant a declaration of atheism. He acquired the epithet “the Great” due to his embarking on military campaigns for the expansion of Prussia. Man requires no help or sanction from God to wage war.
There may be myriad reasons for, and causes of, war which might involve massive armies and prolonged fighting, or individual acts of violence. However, justifiable or otherwise those reasons and causes may be, perpetrators are responsible for them, not religion, not God.
It would be quite possible for deists to become instigators of war; after all, Frederick the Great regarded himself as a citizen of the Enlightenment who applied reason to his belligerent rule. This demonstrates deism or atheism are no guarantors of peace. The difference being neither can use God as an excuse.
Man must accept and bear the responsibility for his or her actions.