We know that there are qualia, for the obvious reason that we are not p-zombies: and we know that consciousness is created via neurons in the brain, for we can map a correspondence between qualia and brain states

Some questions here. How do you know that other people are not p-zombies? Presumably you believe them when they say they have qualia! But then those speech acts are caused by brain states, and if qualia are epiphenomenal, the speech acts are not caused by qualia. Similarly, the correspondence you describe is between brain states and reported qualia by other people: I doubt you've ever managed to map your own brain states to your own qualia.

Related, how do you know that you were not a p-zombie every day of your life up to yesterday? Or that if you had qualia yesterday, how do you know that you didn't have a green quale when looking at red (stop) traffic lights? Well because you remember having qualia, and you remember them being the same as the qualia you have today! But then, aren't those memories encoded in brain states (neural connections and synaptic strengths)? How could qualia cause those memories to become encoded if they were epiphenomenal to brain states?

Stuff like this makes me pretty sure that epiphenomenalism is false.