As an atheist one of the questions I get asked the most from theists is how can I be so sure that there is no God. I know that no answer I give will ever convince them of anything, but I am convinced to my own satisfaction that there is no God. Although I don't believe in any gods of any religion I am capitalizing the word God here to single out the traditional deity of Judaeo-Christian mythology.
Theists like to point out that by simply seeing all of the wonders of nature and the so called natural order of things one cannot help but come to the conclusion that there was a creator. I think that this is a very weak argument and I beg to differ as to the conclusions. When I see our natural world without the glasses of faith and folklore I see amidst all of this apparent order plenty of chaos.
Our planet for example is constantly bombarded by asteroids and comets and all other sorts of space debris on a daily basis. The insane weather patterns are far from orderly as well. Natural disasters are best explained naturally because we know how they occur. There is no need for some angry deity to be called into the explanation of some random event that costs the lives of many.
Everyday I am reminded why I think there is no God. I am surrounded by tragedy at all times and no matter how horrible or devastating an event may be; life goes on. Every day thousands of people die and as has been displayed in the past, like disease death does not discriminate. You are never too young or too old to die, just the fact that you are alive makes you a perfect candidate. When you finally realize that despite what you have been taught in the bible about your special place in the universe,you will come to see that you are nothing more than just another part of a larger picture.
Mankind has demonstrated that they have a penchant for vanity since the beginning of their existence on this planet. Until the theory of evolution came along we were all content to believe that we were God's special creation made in his image. That we were above all other species on Earth. Nothing could be further from the truth; when you realize that you are just another cog in this machine called life then you will see the world as it is. The world is a natural place with natural occurrences that happen daily despite who you think you are.
Earthquakes, tsunamis, tornadoes, and other natural disasters just happen and when you realize this you will see that this explanation makes a lot more sense than trying to explain everything with God. God did it does not work in a natural circumstance and neither does it work to explain the unexplainable. Death,nature, destruction, love, joy, life, and many other things confirm to me that there is no God and that the world is a better place without one.
Finally, there is no why question as to our existence. Why ask why? It is so much easier if you found purpose in life itself. This life we live right now at this very moment is worth much more than any promised life of eternal bliss derived from ancient myths. All I know is that I was born, I am living now and trying to make the most of what is my life and what life itself has to offer. I am sure that one day sooner or later like all other life forms on this planet death will finally come for me, but until then I will make the most of what I have. When mankind can put aside their ridiculous myths then and only then will they be free to enjoy this life and enjoy the here and now.