Help me figure out what this film is.

So the other day I was watching "The campaign" (the one with Will Farrell in it)
There's a scene where he's in a church and theres loads of snakes, he gets bitten. (I was going to post a link to the scene but there's lots of swearing in it so don't think it'll be allowed 🤣)
Thing is when I was watching it it took me back to a film I saw when I was a kid, only that particular scene and I remember feeling that sick/scared/awe feeling you get when you watch a scary film when you're a kid. But I can't remember what film it is!
Its killing me not being to remember and now my friend thinks I'm making it up but I know I'm not!

Here's what I remember.

There's a woman in a church, I think that's lots of other people and there's a big glass pit with sand and snakes in.
She's wearing a white robe/dress and has wild hair (think carries mum when Carrie curicifies her at the end) well she's praying and steps into the snake pit (there's rattle snakes in there)
And they all start biting her legs.
That's it 😕🤣
What film could it be!?
I was thinking omen (I loved that when I was a kid, then one with the girl in anyway) but I've looked and it doesn't seem to be that.
I've typed in "woman gets bitten by snakes in church, old scary movie" and such into Google and YouTube but can't find anything.
Anyone any ideas what it is??