
Spoilers! Some lengthy input from a guy that studied in Catholic school throughout their childhood lol
First let's start with what's obvious, the cross in the title, lambs as a significant part of the story, yada yada. There's the guy's warning to Dennis, to not trust anything in the fields. It's typical in religion, constant warnings of sin and temptation, yet never really taking it seriously, almost always reassured the the victim will never be them, that they they would never fall for it, causing them to underestimate it and leaving them unguarded.
Really interesting symbolisms! I think there's some biblical implications of temptation too. The devil knows what you wants, and when you're at the most vulnerable, it strikes. For example, Dennis was bored after a month of taking the deal. "Coincidentally", Todd appears, ready to be the spice of his life, the love he's never had. The promises, the allure of having someone permanent to hold, after what seems to be a history of broken relationships (referring to him saying "You're going to leave like everyone else?" or something like that). Also, Dennis had what is typically referred to as angelic traits. Not only appearance-wise, but also personality-wise. Nurturing and loyal, naive and pure. And it's common in BL, but the clashing appearance of the main characters can also play into that(i.e blonde and brunette,. Especially the eyes. You can see so much emotion in Dennis' eyes but Todd's? It's either blank or scheming. It's the abyss, a foreshadowing of what's to come. But of course, Dennis is blind to it, he only sees what he's been promised or perhaps he came to love it as well. ALSO there's Todd's "kill the lamb if you love me, if you're truly devoted" scene. To people who has read the bible, or was in Catholic school(like me lol), it's a familar scene. Abraham, who was commanded by God to kill his son Isaac to prove his faith and devotion. Am I overcooking with this one? Maybe, but it's an interesting allusion if so. And when God saw Abraham really was about to kill Isaac, he provided Abraham a ram to sacrifice instead. But this one showed how the devil would do such a scene, no takebacks, no easy way out. Additionally, it was what sealed the devil's deal, the final nail to the coffin.
The devil isn't always grotesque. It's doesn't always induce fear, instead it seduces you with beauty, with promises of what you deeply desire. And for Dennis, it was someone to love, especially in a world that isn't widely accepting of his preferences. This is obvious by how easily he gave in and how deeply he fell(in love or in depths of hell, you decide.)

I began reading the novel and oh my god, it's about to get intense hehe(pls read the novel if you can it's genuinely so interesting+some scenes are omitted lol)

I recommend checking it out on novelupdates and just click the links there! Sadly it isn't completed yet. Some websites don't have all the chapters. The good translation is in Strawberry Moon's Patreon(dw it's free) but it's missing a few chapters in between, which you can check out in the novel updates page.
Here's the link for Strawberry Moon's translation
https://www.patreon.com/posts/eb-prologue-118610973?collection=1222215

The author is so damn sadistic and dedicated. Other manhwas would just start from the time they've been apart and just occasionally flashback to their youth romance, but this one in particular makes us live through their happy moments in the past, knowing full well they're going to be separated. It makes it so that we have a constant foreboding feeling of dread, knowing that after their wholesome and romantic moments, they'll have to suffer unfortunate circumstances and dreadfullly traumatic experiences, as well as the hateful treatment of certain people in their lives. I applaud the author for their storytelling and masterful strategic skills in hitting people's emotions right at the gut.
God, how I absolutely hate the icky piece of shit. Judging by the fact that he has a gambling addiction, I hope he will end up as a homeless bum, with insurmountable debt so that he will likely be left to swim with the fishes thanks to loansharks. How I hope he will die alone, with nothing, not even dignity, to his name. If everyone will not forget him, I very much hope they will remember him as a good for nothing leech, an inept and utterly deplorable scum of the earth.

I love your analogy so much LMAOO
Yet of course we still eat it anyway because hey, we're all masochistic here, reveling in the sweet pain we call angst. I do think I'll be putting this on hold tho, I don't think I can stand having glass lodged in my throat for MONTHS waiting for the second season ಥ‿ಥ
Real dictionary definition of freak4freak lmfao