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https://www.mangago.zone/read-manga/baraou_no_souretsu/
imo this was a really good read, and there is a bit of religious symbolism if you dig deep enough plus some historical references
https://www.mangago.zone/read-manga/my_childhood_friend_was_a_god/
maybe not the religious symbolism you’re looking for but this one shot was really sad but cute
https://www.mangago.zone/read-manga/to_you_the_immortal/
also may or may not be what you want but this gave me same kind of bitterness that punpun did and is really tragic at times
https://www.mangago.zone/read-manga/boku_no_gemini/
super sad and angsty
idk if you’re a book person but classics definitely have what you’re looking for!!
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My crybaby list :')
https://www.mangago.zone/home/mangalist/2628518/
can someone plz recommend a tragedy i wanna find something like haruka tooki le or even oyasumi punpun,, i js want something thats devastating and it having religious symbolism would b a plus!!