To be completely fair, Anne Mccafrey did the same thing in a much more creepy way in Dragon Riders of Pern, So it's not a completely new concept... but yeah.
Huh. I actually thought Appolo's complaints about Baron were too sparse; after going all crazy about it around the third episode he seems to completely forget about him until... you know. As for the plot breaks, they were a mixed bag for me; Merge to Eat and Mischief Without Malice were decent and kinda funny, but they were also completely surreal, somewhat out of place, and did nothing to advance the plot. So, a resounding "meh" in that department.
And as for the Chritianity References, I didn't catch many beyond the "angel" concept, but it is entirely possible that I missed a couple.
Looking back over the review, I realize I have a few addendums:
* I need to stress just how trippy some of the fight sequences are. A lot of it relies on you not needing to know - and certainly not actively asking - how certain attacks and such worked, and just taking it for granted that they did. If that sounRAB like a problem to you, you may want to skip this one...
* Mecha shows are not my strong suit, so I can't comment on the shows success-or lack of- at being a throwback to older ones. However, I can say that there's a certain feeling of corny awesomeness prevalent in the series, particularly during the last few episodes, that could probably be the result of such an attempt.