I am really really not looking for a fight on this, but I am genuinely concerned for the children of a (once) close friend of mine who I have been speaking to this morning.
Maybe this is more a parenting ssue than HS< if it is , please tell me nicely and I'll take it elsewhere. I've namechanged as the Mum knows I use MN.
SHe has 3 dc, aged 9, 7, 5, none of whom have ever been to school. I have no bother with this - I am happy with the school-based education my own dc receive, but am quite at home and happy with the concept that school is not for everyone and am delighted that we have the choice to HE if we want to.
However, the parents, especially the Dad, started out as fairly strict Evangelicals and it has just got more extreme over the last few years. One of the main reasons they give for homeschooling is that their children are not exposed to "spurious" science (like Gelology, Geography, any history going back more than 6000 years, archaeology, physics and especially biological evolutionary theory). They are outspoken 6-day young earth creationists and genuinely believe the earth was created in 4004 bc, sometime in October I think!
The children go to no home school groups, live in an isolated house in an isolated area, go to no after school type clubs, either sports or cubs/brownies etc, they go to church but there are only 3 other children in the church. From Monday to Friday they never leave their house except to play in the garden, they are only "allowed" to go out when Dad is there to go with them.
They follow a strict HS curriculum from the US which spends more time on RE and learning bible verses off by heart than maths or English.
The final straw is I think that we had asked to pop in and visit them when we are going to be in their part of the country during the Easter holidays. THey have said that they would love to see me and dh but feel it would be too "disturbing" and "upsetting" for their dc to see ours, as they might talk about school and, as she put it "the things you believe in, like fossils and dinosaurs". And during the conversation she dropped in that they had told their children that the earthquake in Japan was a punishment to the country for rejecting Christianity!! 
Flipping heck, I sound like a troll. Its just all the worst excesses you could think of, rolled into one. And it makes me cross cos I am a CHristian as well but somehow it doesn't count to her.
I've said I'll speak to dh, but its unlikely we could do an evening with them as we don't know anyone else locally so will be stuck for childcare.
Do you think it is reasonable or unreasonable that I am concerned for her children - and is there anything I can do about it?