Ian,
Thank you for this point! Samir Selmanovich's work (It's all about God) first introduced me to this notion that 'we are all wrong' and I love it! I think it is an important reminder, one that can unite people of all religions (atheists included). Have you read any Peter Rollins? He also has a lot of cool ideas about the very nature of God is to be concealed (not 'revealed')...and it is through His mystery that we learn so much (very poor paraphrase here! Peter's words are much more brilliant!). 

I hear your caution on not equating religions. And on my journey I have found great richness in trying to elevate my mind above the specific word choice of a faith path, and TRY to get in touch with the heart/the intent/ the message. It is somewhat easy (for many) to divide religions, but for me, I find such deep peace in recognizing (and even accepting) the unity present.

I very much benefited from a concept I learned at a Buddhist temple, that ALL our words will fall short of the divine and that we must not get caught up (attached) to the words themselves.