IMHO it would be a sin to eat moldy bread! I sometimes recall the Salem witch trials in which people ate bread made with moldy rye and had ergot poisoning and hallucinations, causing the townspeople to accuse certain folk of witchcraft and devil worshipping.
I don’t even feed moldy bread to birds. It is thrown away. I usually have bread left over every week, before it gets moldy and bad I stick it in the oven for a few min to dry it out, crumble it into pieces and keep it in plastic bags. It is then given to birds around my area. Since we use multi grain bread they are really getting a treat.