Atheists: What are you sure of...?

I am sure that life will always be a mix of good, bad, and everything in between. I am sure that humans will fail me from time to time, and I will fail others from time to time. I am also sure that humans will exceed my expectations occasionally and I will exceed my hopes for myself once in awhile. I am certain that I will always love my son, no matter what. I am sure that I love my friends and am lucky to have them. I know that I will always love the feel of the sun on my skin, being out in nature, pursuing my many interests, learning, and helping my fellow humans and other living creatures when and where I can. I am also very sure that I will sometimes have "low-level immature responses" just as every other human being, regardless of belief/philosophy will. I am sure that my life is not all that different from the lives of believers since a) I once was a believer myself and b) I know, as do most of us, many believers. I am sure that my life will end, just as every other life before me has ended and just as every life that currently exists along with me will end. I am sure that this life is very important because it is all we know for certain exists. If there is any kind of life after this we can deal with that when we get there. If there is not and we have spent this life preparing for what does not exist... well, what a waste of the one life we do have. I am certain that many believers fear to let go of belief for they feel they will lose a sense of purpose and meaning. I am equally sure that life has purpose and meaning regardless of religious belief for we bring meaning to our lives and do not need to have meaning handed to us. We can choose to create meaning and purpose. We can choose to have internal guidance rather than some 2000+ year old external guide. I am absoultely sure that believers and atheists have much more in common than they have differences, but that the differences that do exist tend to blind us to our human commonalities. I know that what many Christians claim to be "Christian values" are often values that belong to all of us and that Christians did not create them. Love of friends, family, and the urge to do good, however one defines "good", are common human characteristics. I am certain that we are all a mix of what we call good and what we call bad. I am sure that if there was an all loving God worthy of our love, He would not be nearly as petty as most believers make Him out to be. No God worthy of the name could possibly punish us eternally for things we cannot begin to understand. And I am quite sure that most Christians on here will reject most or all of my answer. :)