>>719087878
The worship of the Angel is transparently a Christian analogue (culturally and aesthetically at least) and there's cultural Christian language like Christmas and "oh my God" because Toby is an American writing for a culturally Christian audience and it's always better and easier to just leave that alone instead of doing the cringe thing of swapping in the fictional knockoff religion (eg. "oh my Angel")
The overtly Christian symbolism and references are mainly meant to be noticed and interpreted by the player. I would still treat it more culturally than theologically. Gaster is a clear Satanic archetype but that doesn't necessarily mean he's evil or even an antagonistic force (to the player). The player is "The Angel" but we can also be "the demon heart," just like Noelle has the most "angel" symbolism in the story but can be twisted into a force for evil. Remember that "angel" just means "messenger."

>>717467218
The Black Glass is some kind of tainted Determination/"crystalized darkness" in the same way that the Shadow Crystals are crystalized Determination
Dess was lost in the Dark World contained in the Shelter and was transformed into The Knight by being exposed to the Black Glass

>>713938543
>Ralsei doesn't like the church juice
>Ralsei has absolutely no reaction to the BitterTear
Huh

>>713854987
A Black Shard?

>>712517735
It's a physical object
Shadow Crystals are crystalized hopes & dreams, physical Determination
The Black Glass is its opposite, physical darkness, whatever that means