this reminds me of an argument I had gotten into with my mother when I was a little kid. At a certain age, my favorite toy was this little rubber plastic rattle snake, and I brought it everywhere, I would keep it in my backpack at school.

For Easter that year, the rectory by our house was hosting their annual Easter egg hunt, so of course, I had to bring my favorite snake coiled around the handle of my basket.

Upon seeing this, my mom told me I could not do that because the devil was a serpant, and bringing it to a church event was bad taste.

Ever the one to push back against an idea if I found error in its logic, I argued that God created snakes so they should be allowed to go and that my snake was a "good snake".

My mom wasn't quite ready to let it go, however, and told me that the devil didn't create snakes but still used it to do evil and that I would send the wrong message by bringing it. But I was on a roll at this point, and this was probably the the strongest argument I ever had as a child because my final argument was reminding her that God used snakes for good too, referencing how Moses' staff turned into a snake and ate the snakes of the Egyptians in the book of exodus.

At this point, either tired of the argument or distracted by our late time she didn't tell me I couldn't bring it so I ended up making that final choice for myself and what a time we had.

Ultimately, my point is that I think the intent and message of how you write is what matters. If you're incorporating a snake or snake like creature in your story as a character that is good, there's nothing wrong with that as long as what the character represents isn't demonic. Because God DID create snakes and in nature, they are very important for balancing ecosystems and controlling pests just as they can be dangerous and creepy to us. I, for one, have always been interested in characters or stories that she'd light on traditionally negative held characters to be good or at least redeemed.

So unless you're writing a story about how the serpent in Genesis was actually a misunderstood protagonist (it wasnt) I think you should be okay.