User blog comment:Touchinos/“Our Father, Who Aren’t in Heaven” Discussion/@comment-27669262-20191213174837/@comment-31057575-20191213200305

Lucifer knew what happened because he possessed Castiel and, most likely, saw his memories to obtain all the informations he needed and to pretend effectively he was Cass. By the way, if you realize that all you believed in for almost 14 billions years is not true, well, you'd start re-organizing your priorities too.