Please present positive arguments why you think atheism is true

[Cyberman]

Other than our own consciences

so why do you have a conscience, but animals do not ?

I will not say this again; please do not take my words out of context. Here is the context, for reference:

There is nobody that can say, you are wrong and right.

Other than our own consciences, family, friends, law enforcement, society at large, then you have a point. Under your hat.

Besides which, have you ever owned a dog? They most certainly know right from wrong and know when they have done something wrong, the working definition of a conscience. Then we have these beasties:

http://www.youtube.com/watch?v=vyd6om8IC4M?rel=0

The point I'm illustrating is made in the first twenty seconds but feel free to watch it right through if you like.

Even if no other animal on the planet has a conscience, that still does not imply that it had to come from somewhere outside of us, implanted at some point in our gestation (which raises the question of when this operation occurs?). We are a social species, living and working together - not necessarily in harmony but at least towards the same basic ends. We tend to care what other people think of us; generally speaking, we don't want to feel like an outsider. We also tend to imagine how our actions affect other people, would we like them to happen to us? Thus we will often question our own actions: how would others react if I did this, what would people think of me for doing that? (As for the other, well...) It's called empathy. It's notable that people who display a lack of empathy, actively or otherwise, will often rub people up the wrong way. See my very first comment in this post for a good example. In the worst cases, such individuals get labelled criminals and sociopaths.

As the great philhellenes once said in a video, there is someone I have to face every day who knows everything about me, who judges me and will remember everything I do. He's in the mirror.