General

can we talk about how this thread has been in the "chat" section for like 3 days but all the cool "chat" threads get moved to "fun" in .2 seconds like

Buso Renkin is pretty close, hue

As for anime regarding 'abominations' and 'playing god' there are plenty of those

none
FMA is one of a kind

Bleach
One Piece
Naruto
Soul Eater

Fate is good
Code guess
Evangelion 1/2/3
Gurren Lageen

Happy viewing

Why are people always so vague with these "similar anime" threads? lol. Similar in what way? The style, the setting, the story, the dabbling in taboo? There's a lot of anime that can be called "similar" depending on what you hone in on.

For instance, Durarara and Baccano, are made by the same author, so they both have the same chaotic story telling that jumps between a dozen or so characters, so people recommend one if you liked the other. But the genre's and setting aren't really all that similar. Baccano is an action/comedy/historical seinen (seinen being mostly aimed at adult men), that focuses on mobsters in 1930s chicago, while Durarara is an action/mystery shounen (shounen being mostly aimed at teenage boys), that mostly centers around high school kids in modern day japan. So "similar" can mean a lot without really giving you what you're looking for. Not trying to sound jerky or anything, just you really have to be more specific about what you're looking for unless you want to trial and error until you find something that hits the nail on the head for you.

But for basic recommendations, you may like:
D. Gray-Man
Busuo Renkin
Baccano
Chrno Crusade
Ao No Exorcist
Code Geass
Attack on Titan (what? people say it's similar. look at them, not me lol)

I always felt that FMA was comparable to Avatar the Last AIrbender (FMA being the more "mature" version) but you've probably already seen that

Full Metal Alchemist: Brotherhood

since they're 2 versions of the anime lol

Noragami? idk ihaven't been watching much animu as of late

Gintama

Go watch Fate/Stay Night Unlimited Blade Works or Fate/ Zero