Blake's annotations to Thornton's translation of the Lord's Prayer (Erdman 667-70) indicates his contempt for the forms of conventional religion. But he lived with it all his life.
If we don't forgive, we're not forgiven. A fundamental, ubiquitous (virtually universal) sin is to project our failings on to another. The biblical term was the scapegoat. We have many, including our many prejudices, and Blake was no exception.
Start with the schoolmaster when he was six; move on to Sir Joshua Reynolds, the first and perhaps greatest artistic disaffirmation. Move on again to Bacon, Newton, and Locke, Blake's fundamental philosophical enemies. Finally there was Hayley, his corporeal friend.
These were lifelong attitudes. Plate 98, (line 10) of Jerusalem shows how, when and where he forgave all these people; it represented the universal forgiveness, "when once [he] did descry, the immortal man who cannot die".
Blake was ready to move on (decisively!).
So much for Blake, but what about me (and maybe you). Reading Blake & Persona led me to understanding that I have some more forgiveness to seek. In my youth I presented a formidable persona like don't touch me; don't try to get close to me; there's no way!. As a Christian (and then Blakean Christian) I thought I had given that up, but reflecting on recent exchanges I see it's still there. God forgive us for hiding from everyone.