Thinking of not doing Santa.

Guys how should I go about not doing Santa at my house when my daughter gets a bit older. Husband and I can't agree yet on it but I honestly think it's a bit silly to do Santa. I want my children to know why we celebrate Christmas( I'm Christian). Even if you're not Christian, how did you go about explaining  to your kids that Santa isn't coming or whatever? Also what about the kids at school? Did anyone ever have issues with the kids at school bullying your kids because Santa didn't come?