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I think critical evaluation skills come when they are older than 6. My eldest has got very into religion as she gets taught it as part of key stage 1. One of her teachers is clearly an active Christian so she believes a lot of it. For now. They are doing Judaism this term, which is entertaining. (As an aside, she associates vegetarianism with Islam, as all her Muslim classmates eat vegetarian school meals as the meat options aren't Halal. They are not the Muslim kids, but the vegetarian kids).
don't underestimate a kids ability to see through bullshit when it's patently bullshit.