Poser World has a Biblical Gown here   http://poserworld.com/Downloads/Michael.4/11172/Dynamic.Biblical.for.Michael.4.aspx

If you are not a member, they have individual downloads for sale, but I don't know if this is one of them.  (they are also running a half-price membership for September).

I guess the morph to make a Jesus would depend on how you want him to look.