I'm not sure how hopeful I am for a good film, based on comments like these ...
I believe the “acid trip” comment was related to the script’s grandeous plans of showing the angelic battle between St Michael and Lucifer and then the devils in hell reacting to Christ's death on the cross as well as Christ's visit to the Limbo of the Just pre-Easter.
Gibson said that in order to truly understand the significance of Good Friday, and the Resurrection, you have to go back to the beginning and see the origins of Lucifer (maybe even Adam and Eve?) and then explain Eve battle between good and evil, which ultimately, Christ won.
If anyone could direct such a thing, it’s Gibson. He has an incredible talent.