I've never heard this argument before, Lilith. It's logical and simple and irrefutable.
P1: The name of Jesus has power (casting out demons, altering river flow, moving mountains, etc)
P2: Jesus was not the name originally held by the Messiah as it changed form numerous times to become Jesus as we see it today.
C1: The power does not come from the name Jesus afterall, then.
C2: Magic doesn't exist, so there isn't power like this anyway.