On William Blake's "Marriage of Heaven and Hell"

Just want to know your opinions regarding this work's philosophical implications on institutionalized religion. What can you saya bout the "contraries"? I think a lot of people misinterpret Blake as merely defying Christianity. I mean he wouldn't mention Isaiah and Ezequiel if he thinks the bible is not worth his time. Perhaps he was just offering a new understanding of what religion should be? Of what way of life should be. What do you think?