IME it’s minimal at most non dom primaries and non existent and most non dom secondaries.
Primary schools usually do something once term around Christmas and Easter and a leavers service in June. They may also have events to mark other things such as Halloween , Diwali, Chinese new year.
It often depends on the demographics of the pupils - teachers use these events / celebrations to make all the children feel included and to educate them.eg a school with Ukrainian children might do an event around old new year on 14 January .
Contrary to what some people seem to believe, teachers are not religious nutters out to indoctrinate your child. They are too busy trying to get through the curriculum and give your child a broad general education. Learning about different faiths and beliefs ( like your own @NovaSkycrest ) is a small part of that.
As PP have said, any church services are usually of the Christianity lite “ be kind “ variety. Yes you can withdraw your child from this but I’d ask you to think twice before doing that.
It can be quite sad for your child as they feel excluded from what they see as fun events that everyone else is doing. Do you really want your child to sit in a classroom alone colouring while everyone else is practising for the nativity play, dressing up as angels /shepherds and signing songs about donkeys?
IME the only parents who withdraw their kids are the militant aetheists or very strict Christian sects. The Muslim / Hindu / Jewish / Buddhist kids are all up there taking part. Their parents don’t seem worried that they will “catch Christianity “ by seeing a doll in a cardboard box lined with straw or eating a chocolate Easter egg.
You need to accept that If you send your child to school in Scotland you are not going to be able to stop them learning about any other belief systems apart from yours. They will be taught about many beliefs in RMPS and you can’t withdraw them from this.
And teaching your child to mock or ridicule ( calling it nonsense ) or to be hostile to others people’s beliefs is not going to help them in school or life in Scotland.
If that’s not acceptable to you then you may be more comfortable with home education , where you can prevent your child learning about any beliefs apart from your own .