I Need To Rewatch To See If He Does The Blessing Often Or If Zach Did By Coincidence Once - Tumblr Posts
I included the original tags as the first 2 for reference.
Regarding the apples (he's seen eating 3 in the show), he says: "Forbidden fruit, my favorite," last time he's shown eating one. Then there's the wall in his apartment that's covered in "Forgive me Father, I have sinned," written over and over in what looks like blood, possibly what's still wet on him from his kills when he gets home. But you missed the most obvious one.
Sylar crucifies his "unevolved" victims. Go back and look at the way the bodies are always high up a wall and pinned to it with objects impaling their limbs. He does this because they're innocent. They have to die for the "sins" of others because they're in the wrong place at the wrong time and he can't risk getting caught so there can never be witnesses. If he'd gotten RenΓ©'s ability he 100% would make those people forget his face and probably that they saw the murders at all to spare them. That's not just conjecture either.
When he calls Mohinder because he's confused and concerned about himself possibly being the bomb he tells him that it makes no sense saying: "Why would I do that? They're innocent. There's no gain."
Also, on the subject of that call, he makes it immediately after killing Isaac, who is still lying dead in the room at the time. When he kills him, he pins him to the ground telekinetically then crucifies him with paintbrushes to keep him from getting up.
Gabriel definitely has religious trauma or, at the bare minimum, a deep resentment for it. We know Virginia was religious because when she freaks out about his abilities she says he's not her son and that he's "damned" then proceeds to demand that he "give back her Gabriel," which suggests she believes he's possessed.
Also, Peter (who we know is religious because he's shown praying in a church and we hear his prayer), crucifies Sylar with a nail gun when he tries to force him to turn back into Nathan. I felt that was a nice karmic come around.
If you like religious symbolism and/or sacrilege, check out my smut fic of Sylar as a Catholic priest falling to temptation and sin.
Sylar + catholic symbols π©π©π©π€π€π€