Japan is also a great answer to Pascal's Wager.

In a nutshell — those who know Pascal's Wager can just skip to the next paragraph — Pascal's Wager is that if you die believing God exists and you're wrong, that's better than dying believing God doesn't exist and being wrong. So if God is real and you chose Atheism, you wagered poorly. The problem with Pascal's Wager is that it only works with one religion. With thousands, it falls apart; as any Atheist will tell you, the difference between us and a Christian is less than 1% — we both don't believe in thousands of gods.

Japan alone has thousands of gods, but it does not have a traditional "creation myth." Like many pagan countries, it has many deities; however, none of them are creators. They're all responsible for little things, or small areas. Pretty much each shrine you see is to a different one.

Getting into anime, as one does when Japan is brought up, Noragami is about a god (higher power, not supreme being, so lowercase "g") who is trying to make a name for himself, so he works for ¥5 (less than 1¢, IIRC) doing odd jobs, trying to gain favour among the local populace. (It's a bit of a comedy as he is indirectly responsible for killing a high school girl, so he escorts her spirit around trying to bring him back. He also has a father/son relationship of sorts with a little boy who can turn into a weapon for him, though it's not really a fighting anime. His last "weapon" was a teenage girl who left his service in the first episode. The whole anime is comedy/satire.

As for Christians in anime, it's rare but there are stories about them, and they tend to stand out. The Colors Within advertises itself as a movie about a girl who can see colours in people's hearts, but that's barely mentioned once or twice. It's more about a Catholic girl in Japan who plays music and some in her church are against it.

Then there's Mother's Rosary, the seventh Sword Art Online book. If this were a standalone anime, it would probably be in my top 5. As it is, it's the last 7 episodes of season 2, so it's kind of difficult to get to if you're not a fan of the series. The girl featured in the story and her religion being Catholicism doesn't seem that important, but it does play into the story and it informs some of her choices. I'm sure they could have made it work had she not been Catholic, but that's the story as told.

I don't think most Japanese people believe in a creator, per se, but again, like pagans, they do have minor gods they pray to for things like the weather, harvest, luck, and whatnot.