Consider that the Morninglord faith is an aspect, although estranged aspect of the Lathanderite faith. It doesn't entirely have a naturist slant per say, but the concept of cycles and rebirth would be key to it - it comes into play with the forgiveness aspects of the faith. While you are arguing that they are completely opposed to resurrection: I disagree, but I do say that they wouldn't just resurrect people all willy-nilly. They are of a kind and hopeful nature - but its just kind of silly how they are represented in the game currently.
Death is not treated as seriously as it should be and there is an aspect of this that needs to be community enforce, by good and positive example. Maybe as well as a mechanical focus - but really, we should all be working on:
1. Treating death like death. Death is disorienting, painful - soul shaking and will most definitely take one out of game for a little bit. People just hopping up and going back into the fray are not leading a good example for others or new players. Raise Dead specifically will mess you up.. you basically come back into a painful, torn up state barely between the states of life and death. Resurrection brings people back with no rez-penalty - but you still should probably have some period of confusion, weakness. You were just dead, now you are not. That -is- something to question, ponder.
2. Acknowledge NPCs. You need to acknowledge that while this soulless NPC is raising your friend - (For prices that would be considered kings' ransoms to the local population...) - treat the moment seriously, not just a 'LOL I DROP A BODY OFF FOR LIZUCA'. You just had to suffer a friends death. Now you are being granted a MIRACLE. Why would you treat it any less than that? Even if you're a Faerunian, or someone from a world where there is magic - resurrections still are not that common. They are still miracles.
3. From an observation of Barovian culture, they do very much except the healing aspects of magic. This is a result of the Church of Andral, and its impact on the society of Barovia. But since the demise of that faith and organization, there have been very few to replace it. They still would, in my opinion, turn to these things as a last result - preferring mundane methods beforehand. (As should any Cleric, just because you can, doesn't mean you should and the mundane methods can be treated awesomely.) However - I can see big issues with over-saturation of raise dead - publicly, that is... it stems from the spell itself, the act, being one, RELIGIOUS, two, IMPORTANT, and again.. RELIGIOUS! One it'd be a big religious ceremony (I don't think Barovians would be comfortable with big cult meetings, centered around raising the dead, honored or otherwise).
4. Which brings me to this point. This whole event is religious. While the Morninglordians are tolerant (but I do not buy in to them being so tolerant that they'd be smooching Caliban and defending dog-legged tieflings, in the very least, not openly - these people are still Barovians and Gundarakites. They are not all CG paragons of smiles...) - the services that they do seek to embolden people to join their faith. There are also some issues in general with resurrecting people outside of your deity alignment acceptance. The ML is listed as CG, that means his clerics could be CG, NG, and CN (not counting people corrupted by dark powers and suffering from delusions). It makes it very unlikely to work out well, for someone who is CG, to resurrect a LE being - something on the other side of the spectrum. There should be a percentage of failure, for every step away you are from acceptance.
I do not think they're going to be up for resurrecting known criminals, animals, monstrous beings - it'll get them in trouble and it WOULD get their organization dismantled by the local government.
5. Just treat stuff seriously. Move bodies outside of the Temple and into places where they should be. Take them into the graveyard out back, or into one of the tombs. Go take someone and 'bury them'. Just be surprised if you see that person again. Cry, hug them - question reality and sanity. The person before you has either been granted a miracle or you're in an awkward and dangerous situation with some sort of vile doppleganger.
But yeah, the tl;dr version is this: Treat things seriously. Set examples of 'good behaviour'. I do agree there are too many cheesy or stupid things going on in the Temple. But it requires us as players - and hopefully with the support of the staff, to police and maintain the setting as well as the grounds. (That doesn't mean being a lore-nazi.)
I'd also like to say that if you DO get into a situation where someone is being and complete and total asshead and seems flagrantly disregarding setting/NPCs and all that. Report it to the CC and a DM. Let them deal with it. I'm sure something will happen. (Remember to take screenshots!)