Secularism is by no means any better than mainstream (or otherwise) religious or spiritual belief systems that exist throughout the world. Somehow these atheists and secularists have gotten it in their heads that secularism and atheism are NOT belief systems akin or comparable to religion. This is absurd because secularism and atheism are very much belief systems that shape an individual's life and viewpoint of the universe, the world, mankind, and the individual within it all. So to pretend that there's a gross difference between secularism and religion is to wear very thick blinders. Both are philosophical ideologies at their core and how they effect a person stems directly from that foundation. Secularism is humanism, a "religion" based on the idea that naturalism is all there is and mankind is an accident of nature and little more than a highly evolved animal. Secularism also wishes to eliminate religion from places of education, public discussion, government (and other authority), even entertainment. For a group that loves to preach about tolerance and diversity, they are actually quite intolerant to ideas that do not jive with their own.
Much is said these days in secular circles about religious extremism. The biggest culprit of religiously motivated or inspired terrorism is found within certain sects of Islam, and this has been true for more than two decades now. However non-religious (or vaguely spiritual) people see this and pin the terrorist (or ticking time bomb) on ALL organized religion. They'll point to historic tragedies such as the Crusades and the Inquisition, both taking place during cultures heavily dominated and invested in either Roman Catholic Christianity or Islam. Clearly religion and belief in god is a great inspiration of horror and evil in the world, right? And so non-religion, such as secular atheism or humanism, must then be the salvation of mankind and the end of human on human violence!... Such a belief or statement could not be more wrong.
The problem of extremism or ideologically motivated violence is by no means restricted to religion. It broaches all kinds of belief systems, all stripes of political bents and ALL viewpoints. Christians can easily understand this because we understand that the broken human condition that causes all of this is sin, which permeates and infects EVERYONE no matter who they are. Sin is like a poison. Left unchecked, it is catastrophically destructive and cruel. Secularism and atheism do not even believe in the existence of sin, believing that morality is in large part a social construct and little else. So who is better prepared to address the corrupted human soul? The ones who reject the existence of both soul and sin, or the ones that know it for what it is?
Is secularism the answer to moderating and regulating religion to prevent catastrophic violence between human beings? No. At best it's no better than religion in this matter. However, it might actually be even worse, because it holds no solid moral foundation or absolute truth. The atheist likes to point to tragedies in history connected (loosely or closely) to religion, things like the Crusades and Inquisition. In the secularist mindset, theocracy (government and power held by organized religion) is inherently corrupt or easily corrupted, mere steps from extremist evil. Yes, those particular horrors of history were awful, but religion is by no means the only factor for such occurrences. Neither is theocracies, or political conservatism. Most wars are not religiously inspired or motivated, merely using religion as an excuse for the real reasons for the war, such as greed and power.
Secularism and atheism have a human death count in the multiple hundreds of millions in just the last 100 years alone. The crusades and inquisitions were centuries ago and killed far fewer people on the whole. The inquisitions for instance may have killed a few thousand in all. Secular communism, however, is a very modern social and governmental construct, and it's slaughtered hundreds of millions in far shorter a time period than all religions combined for all of history. Stalin and communist Russia, communist China, and Germany's Hitler and the Nazis in World War 2 were all heavily influenced and inspired by humanism, secularism and naturalistic Darwinism (evolution). In this way you could almost say that communism is the secular version of a theocracy. Germany was the breadbasket of Darwinist thought and evolution inspired eugenics were the heart and soul of much of the Nazi mentality. They rounded up Jews, people of colour, and the physically and mentally disabled for death because they were considered inferior humans, a detriment to the betterment of more highly evolved mankind. These people were relegated to a sub-human status, and murdered and brutalized because of it. Communist Russia and China killed hundreds of millions in the name of preserving their government control and destroying all opposition and alternate belief systems, especially against Christianity. These were and are heavily atheistic and secular driven belief systems and mentalities that dominate in these large scale modern death camps. Secularism and atheism is in no way harmony and innocence. It's hands are as bloody or worse than mankind's biggest and longest lasting religions, and it's happening today right along side Islamic terrorism. The only difference is that it's institutionalized and government sanctioned. The only difference is that all this genocide is done in the name of man and at the cost and eradication of freedom (freedom that Christianity has been a strong supporter and creator of the world over).
The Real Problem
The problem is not religion, or even politics. The problem is mankind's heart in general. The problem is our eagerness and easily corruptible fallen sinful nature. Secularism and atheism don't even have a "higher power" to answer to or provide them direction, instruction, correction or meaning. To them, we're evolved animals, a cosmic accident of chemistry and physics.
True Christianity is based upon salvation, mercy, love, repentance, and compassion. Jesus Christ came and died on the cross when the Jews wanted him to rise up and become a holy warrior king and save them from the Romans. He refused. He came to save our lost souls, to show us a better way, to lead us back to God through love and mercy. The value of a human life and compassionate love are two monumental core tenets in Christianity. Yes, Christians or people who have claimed to be Christian or do things in the name of God have done terrible things in the past and even the present. But so have secularists, humanists, atheists and Darwinists. Examples of this are the Columbine school shooting in the USA (the two young men considered themselves to be cleansing society of religion and being an instrument of natural selection, one even wore a shirt that said exactly that as he shot his fellow classmates dead) and the murder spree a couple years ago in Norway where an avowed evolutionist shot dead 100 teenagers and government workers in the name of attacking Islam and the tolerance of it. The problem is NOT religion. The problem is strong over the top ideology combined with a lack of loving merciful compassion and the heartfelt knowledge that every life is exquisitely valuable.
Secularism is not salvation for the ills of society. It could be better described as oblivious unintended suicide. To eliminate the God given value of human life, of the soul, and to reduce us all to cosmic accidents and lucky-to-have evolved and survived animals in an entirely cold and callous universe is to beg for the de-humanization of all mankind. Human history both ancient and modern paints us a large scale picture of the evil and cruelty that mankind is capable of. Atheism and humanist secularism are at best no better than religions when it comes to these large scale sins. It's because the problem is not religion, or God, or faith, holy scripture, or even politics. The problem is mankind's ability to twist and warp any and all ideologies and philosophies into dark and destructive tendencies for fortune, fame and power. The problem is sin, something we are all guilty of to one extent or another.
Thankfully there's a means of redemption, forgiveness and salvation found through the death and resurrection of Jesus Christ. We are all His and He loves each and every one of us. That's a heck of a lot more positive and inspiring than, "We're stuff that stars burped out and that chemistry and physics accidentally patched together into complex animals." In Christianity there's a true possible solution. There's an understanding of the existence and potential of evil and wrong in all of us. Compassion, love, and deeply valuing all human life is the only cure. Those principles go hand in hand with salvation through Jesus Christ.
UPDATE
Added links to a few articles giving more detail and information on the topic.
Whitewashing Darwinism's Ongoing Moral Legacy (EvolutionNews, Darwinism's influence taboo to discuss)
James J. Lee, Hostage-taker and Darwinist (EvolutionNews, Discovery Channel shooting in Maryland, plus a summary of other similar incidents)
From Darwin to Hitler: Evolutionary Ethics, Eugenics, and Racism in Germany (Amazon.com)