@reasoning logic,
RL
Now that you have the flavor of Rorty's lecture you may be in a position to reconsider your title "How can we be sure that all religions are
wrong ?" The whole lecture might be considered to be a response to that.
You might also revisit my first answer to this (Post: # 5,305,007 on page 21).
If you do so, you might note that to understand the significance of "context" consider how the fresco /RL transaction of 4.17.13 differs from those of today even though the focus in both cases is on words like "wrong". Rorty's reference to Derrida is precisely with respect to the analysis of context and the shifting value of words..