I am a Jew, so growing up I thought Santa was just some kinda Christmas mascot. When I got to kindergarten is when I realized that kids are just bonkers for Santa. I had a very polite kindergarten teacher tell me that it's a huge faux pas to tell kids Santa isn't real after I really upset another kid, so I just kept that lil secret to myself. Unless someone was being a bully. Then I weaponized it.
I, uh, won't be telling my kids Santa is real. π Buuut I'll also make it clear they aren't to ruin things for the other children. Let them have their fun.