And why did you do this? What made you decide to go there and debate?
Why?
Unless you had asked for my two cents, I would say nothing at all. When God has prepared an atheist's heart to hear the truth and has paved the way for you to speak that truth to them, so long as you are willing and ready to share, it is surprisingly easy to do so. But you'll know when God has opened the way. It is a very different experience from those times when we try to kick down the atheist's door with complex arguments and evidence.
I would ask you to account for the Cambrian explosion and the incredible absence of the multi-billions of transitional fossils that
should exist in the geologic column. I would want you to account for the genetic information that is integral to, and must exist
prior to, the development of any of the biological elements (proteins, lipids, cellular membranes, etc.) of life. I would want you to explain why mutation which more often than not causes only a reshuffling of genetic material and/or a loss of it, can move the process of evolution forward. By the time a human being is seventy, they have some forty thousand deleterious mutations to their bodies. These mutations accumulate over generations which means that at the rate this mutation is occurring the human race will not last another 50,000 years. How does the ToE square with these facts?
Check out this link:
Access Research Network
Before you take to duking it out with more atheists, though, make really sure your motives for doing so are God's motives, not your own. The quickest way to do this is to ask yourself: Am I doing this because I love the lost people God loves? If not, keep your arguments and evidence to yourself.
Selah.