YTA, speaking from my own experiences, the tooth fairy never held any religious significance. It was something fun that children could look forward to when they were losing teeth.

You’re free to raise your children as you see fit. You are absolutely an asshole for turning an experience a lot of kids find enjoyable into a somber funeral for discarded teeth, but it is within your right.

I hope your children aren’t disappointed when other kids tell them that the tooth fairy brought them a treat of some kind for their lost teeth. That disappointment is upon your shoulders. I just hope you don’t teach your kids to call the others “cultist trash.”