I'm not studied enough to be able to speak to all of the OP, but the concept of resurrection seems to be to be original to the Christian movement.
I wrote about it here (it's not long and the sources are at the bottom).
http://morethanmorality.blogspot.com/201...n.html?m=1
I wrote about it here (it's not long and the sources are at the bottom).
http://morethanmorality.blogspot.com/201...n.html?m=1