I'm sincerely voting that this thread get closed, despite I'm a non-Christian/seeker and all.
I have but a few words to say if I could, first of all, this is typical conversations with athiests no doubt, if you can't answer their questions they will rip you a new one like a wrotweiler that just got nuetered. (I don't care about the spelling of the word as you know exactly what I'm saying.)
Furthermore, this is just outright flaming, I agree with everyone here who says that these guys didn't just come to ask questions, it's almost as if they came to insult.
The reasons I will never be an atheist is because the common athiest is arrogant and condescending, he looks at the Christians as "stupid and zealous" and has a persistent joy to go looking for other athiestic material to feed new thoughts, just as the everfamous: "If God exists, and is all knowing and omnipresent, he should be able to stop evil, but in reality evil exists so God does not." Here's a simple newsflash if you really want your question answered, rather, this is an interesting question I think YOU two should answer yourselves, ready?
"If you do not believe God exists, and you, by defintion, being an atheist, do not live by or abide by any written moral codes or standards, except by those set by yourselves, then how does one, such as yourself, go about determining 'evil?'"
In other words if you believe evil exists, you are not an atheist, because then you believe in absolutes, (i.e. "cosmic universal forces that battle each other" and you accept the traditional concept of good and evil by looking at what founded those traditions not knowing it: some of it, even from the bible) and, if evil exists as an absolute, this means it does not come from an evolutionary naturalistic way of the human psyche, but it does, in fact, come externally, therefore, by defintion you would be contradicting yourself.
Still doesn't make sense? Consider that an atheist believes to be a "free thinker" and they do things according to their agenda, if that is the case, you believe in an entirely naturalistic world that is bound by natural laws, but to judge what is good and evil, is not simply a natural law, if it was, you would then be looking at the animals that kill each other for food by calling them "cold-blooded murderers" (after all, Darwin did say we were all related right?) Which brings up my next point, the "communion ritual" to you, that may be cannabalism, but, if we were to look at evolutionary abstract terms, every time you eat a cow or a chicken, you're committing cannibalism, it's just that simple.
Glad to have been some service, that I may have provided an equally refutable way to look into the glass.