What an interesting thought.ive never considered using the Jewish calendar instead of our gregorian one. What would the point be? Just for fun?
I think the Jewish feasts are more important to understand, they run through the whole of Gods plan for humanity as far as I understand it. I think they're like scenes in a theatre play that runs twice, with Gods children as the actors, the first run as Spiritual children, the second run as Spiritual adults before we rejoin our true father at the everlasting after party.