Muffled
Jesus in me
If I had to conjecture...well, not if I had to, I have conjectured in the past on this question simply because I like to, so if I choose to repeat old conjectures, I'd say that Jesus was trying to reformulate Judaism -- to change its stress from legalistic adherence to rite and ritual and focus more on a quasi spiritual notion of "doing good." He did this by presenting his own understanding of written and oral text, and supplementing with his own teachings which removed parts he didn't like and replaced them with his own reformulations. This was an attempt to give an accessible Judaism to those Jews who might have felt alienated by the existing Rabbinic system. So a "new religion"? Not exactly. A new and (in his mind) improved version of the existing religion.
I don't believe it is quasi-spiritual but is entirely spiritual. In that sense there is no change. It is what God wanted from the beginning but people rejected it. The law was a stop gap for that lack.