to break down my anti ep zombie argument

ep zombie philosophy
1) there is no such thing as 'I am a zombie' so 'I am qualia'.
2) Qualia cant effect the physical world (this is ep philosophy)

3) from 1 and 2 - I can't effect the physical world
4) beliefs (as in a logical structure of beliefs) exist in the physical world (stated and also implied by the fact that they can be written down etc)

So

4)a) if 2 (ep philosophy) is true then I am either a believer or a non believer as a result of the physical facts - I (qualia) can't change it.
b) if it is NOT true then I am either currently a believer that it is true or not true and I should if I believe in truth, try to change to not believing it.