DS1 has just started school & had a birthday party today with some of his new(& old!) friends.One Mum phoned to say that as they were J.W.'s they didn't celebrate birthdays & he couldn't come. Now my response was( & still is ), no problem we'll arrange a play date at a later time. But now I'm curious. If DS1 had been invited to a classmates religious festival eg. holi or diwali, I would have had no problem sending him to learn & experience something new. Why is this situation different.Are birthdays sinful in some way? I'm just really curious & I can't ask the other Mum as I don't want to upset or offend her, she's really lovely & I do think we'll get on well when our boys play together. Can someone enlighten me without shooting me down in flames. I'm just really curious about this.