@Miljea - of course you are welcome to your views. I think though you have little understanding of what a religious based education is, any successful indoctrination would be down to the laziness of parents from your post it sounds like you have little concept of what science is as well.
My child has variously come back from school believing things from various faiths as facts, learned from RE lessons and his multicultural class mates. Most of what we teach kids at school is some watered down version of the true picture.
At 8 he understands that different people believe different things and that’s ok and should be respected. Love is better than hate. As parents it is up to us to ensure our children have the necessary skills to find their own path in life. Very few people I went to school with have faith as adults and have not undergone psychological trauma “unindoctrinating” themselves.
Our children are “indoctrinated” every day and various gods are worshipped, be it a supernatural divine entity, or a god of the more material plane, wealth, beauty, youth or whatever the latest hashtag is. Have you allowed the media to become your new church? Indeed science itself is often wrongly held up to be this omnipotent deity that can immediately and objectively provide the answer to Every question. Think about the priorities you put before your children, have you substituted one god for another? In order for a child to find their own way they need to be exposed to lots of things and concepts. School is only one medium for this. We should bring our children up with open hearts and minds not in echo chambers.
I think there is value to a religious education, it provides a framework for dialogue to take place. Simply being exposed to one set of beliefs, even if presented as facts, does not preclude you believing something else.
So yes a 4 year old being exposed to religion does not bother me, even if it is a single religion shown as fact, no more than telling our kids about Santa, the tooth fairy etc, in fact I have less problem with the religious side of things as it holds value in providing a moral framework. Most people’s morals reflect those taught in religions anyway. In fact I used to take my son to church - not because I believed in the CofE theology, but because I thought it important he was exposed to and understood part of the traditions of this country.
Now he’s 8 he believes in evolution, an historical figure of Jesus and reincarnation. He’s also rather partial to classical mythology. School is only a small part of bringing up an educating a child. I would be disappointed in myself as a parent if I let one world view override every other possibility life has to offer.