The Real Jesus is there for the Heaven and Hell summit. Humperdoo is God's creation and He is clearly invested in him as some sort of "other" son. (I, too, thought he was originally supposed to be Jesus.)
The way this show runs, it reminds me of comic books, which is why I like it so much. I can visualize all of the show on the page (if that makes sense).
I'm sorry for Steve the pilot -- but in a way, he reminded me of Roy Batty from Bladerunner -- screaming at God for killing him before his time and wanting more life. It's the age old struggle -- but this time we had Jessie, God's representative on Earth, fumbling impotently in between the two. Vulnerable Man killed by Fate and railing at God for letting it happen -- while the Priest, who is supposed to have God's power vested, can do nothing.
I liked it.
As for sacrilege -- this show is full of sacrilege. I'm sure the comic book was/is, too. If you're going to bring "Preacher" to life, that's what you're committing to.
I, for one, enjoy it. It makes me think. (I'm a practicing Episcopalian, by the way. And I'm not afraid to think for myself.)