As committed a Christian as Blake was, he still receives little or no coinage in conventional religious circles. The reasons are rather obvious: he exploded the pet values and prejudices of the conventional Christian, like the "inerrency" of the Bible, etc. etc.
In MHH Blake promised to write the Book of Hell:
The Book of Urizen shows Urizen (Old Nobodaddy) with the Book of Brass; it doesn't save; it condemns. As Moses (and Blake) said, "would to God that all the Lord's people were prophets", and able to hear God speaking directly in Jesus' tones of love rather than like Urizen heard it.