Well a couple ways....just walk up to her and tell her you've heard her complaining, and ask her to keep her opinions to herself *LOL* Or say that complaining about co-workers is not only rude, but an offence that can get her in trouble. Then complain to a higher up that she is making fun of your religion *LOL*

Throw a snake on her? Okay no no...lol
Just throw a rubber one on her, and call HER the devil.

OKay okay...seriously...slap her. NO okay...
Tell her you've heard her snarking. Then ask her if God created snakes. Then when she says yes, then tell her you admire God's work. Or something.

Remember, in the bible it was said that as punishment, Even had to have a painful period, and the snakes had to lose their legs...just tell her your trying to provide spiritual healing for snake-kind by starting breeding projects to regrow their legs.
THEN throw a rubber snake on her, and then abruptly say that you're sorry because it was your God-bless period that made you do it.

OKAY no....I'm no help at this. I'm laughing though. I was raised holy-roller Pentecostal. I'm not so much anymore, but I have heard people say that having a snake was sinful, or like worshiping satan or something.
If you really want to confront her i'd go with the thread of following up on if god made snakes, and if he hates them, or he he appreciates you trying to rehabilitate them because they ARE inherently evil, after all.

Just go up and ask her "hey, stupid, i mean...*blank*... why do you think snakes have something to do with satan?" and then tell her you really want her to minister to you about the evilness of snakes and what the bible says.

When she says "satan took the form of a snake to tempt eve" point out that THAT was when the snake had legs. THEN point out how he used to be an angel, and then innocently ask if all agngels are evil because he WAS an angel. Then Just tell her that God loves all creatures great and small, and that at least your creature could eat her face for being so stupid.

*snortlaugh*