It wasn't a particularly well-edited mashup, actually. I just thought it was funny that someone would actually think to do that with those two songs.
This being the first time I've really taken a careful listen to Kanye's lyrics and delivery on this song, I have to say (regarding the original "Jesus Walks")... it's not a terribly good song. I applaud a few things that he says here and there, and it's notable for becoming popular despite its subject matter... but it comes off to me as rather awkward and disjointed.
NP: "God Help Me", Rebecca St. James
The way the song is edited in the mash-up strikes me as much more awkward than I remember the original being. But then, I've only heard it once.