This is a tad late but as an indie developer hopefully I can help a little.
I can’t find what engine the original (Resident Evil 1) used so I’m guessing it was just built on top of Home Sweet Home (a prior Capcom game that Resi evolved from). As for the remakes and newer ones, they’re probably being made in RE Engine but I believe that’s proprietary. Honestly though, it wouldn’t be super hard to recreate any of the games in something like Unreal or Unity. There’s plenty of templates and tutorials out there if you’re a beginner coder. Just search for “fixed camera survival game” on YouTube and you’ll find plenty of helpful videos. As for models (which is usually the hardest) there’s a great collection of retro 3D models on GitHub (I don’t think I’m allowed to link it so just search “Retro3DGraphicsCollection” and it should pop up). If you need animations, Mixamo should have enough to get you started.
It‘s really just a matter of putting it all together and knowing what to look for. Hopefully that helps a bit (feel free to ask questions 🙂.
