Quote: Firstly, even though I am atheist, I do believe that it is a faith as
well - atheism isn't any more "logical" than religion. There is no
concrete proof that anything we perceive with our senses, and therefore
the knowledge that we gather of the physical world, is real. I'm an
atheist because I put faith in sensory perception and I believe that all
the evidence we have acquired from observing the world is real.
We can defeat fallacies in sensory perception by using the scientific method and peer-review. For instance, we know that a unobserved particle will literally travel every single possible path to it's destination. We also know that if you stick a sensor on it, it will actually know that it is being sensed, and only take one path.(Google Quantum Superposition)
This goes completely against our sensory knowledge("Common sense") The same for how we know the earth is round, how we go around the sun, etc. We can scientifically prove that. There is little room for interpretation in those cases.
Furthermore, there is a school of thought called "Negative Atheism" which basically says that they cannot be absolutely sure that there isn't a god, but they are still pretty darn sure.(Just like we are pretty darn sure the easter bunny, or the tooth fairy isn't real)