I'm afraid my answer would be to keep children well clear of religion until 18.
Since that does not seem an option here, I shan't dwell on the why.
I've been to a Sunday School once. Southern Baptist. A fun afternoon, really. So I say send them there and turn 'em into little Strikey's.
I also took Bible lessons after school when I was young. Nothing proselytising, just two women telling the biblical stories. I took it out of precocious cultural interest. Never regretted it. It proves one can touch the Bible and still grow up atheist, and it ensured that to this day I know everything about the Bible, such as how God demanded of Adam to sacrifice his only son Mozes for Him but then the sacrificial table broke and so they had to get a sheep which wasn't there so Jesus turned some fish into lambs for them.
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