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I think that most parents, including those who are religious, want positive outcomes for their children. Where secular parents may differ a bit is that they are more likely to desire positive reality-based outcomes. One challenge I'd anticipate, especially for parents who do not have lots of formal science-oriented education, would be how to interest children in science and other STEM fields and how to teach complex topics like critical thinking, reasoning, and skepticism.
I came across an ad for something called STEM Club recently on Amazon.com and was curious about what it was. It turns out to be a subscription for various children's toys designed to "encourage understanding and exploration of STEM subjects for children in a fun and entertaining way." For those unfamiliar with STEM, it stands for Science, Technology, Engineering, and Math. There are three age-specific options: 3-4 year olds, 5-7 year olds, and 8-13 year olds. The description of the service notes that the toys focus on "the development of essential skills like logic, creativity, and problem-solving."
I figured I'd mention this since it seems like a great idea for secular parents of children in the covered age range or others looking for gift ideas that promote critical thinking. I could even imagine an atheist giving something like this to children of religious parents. I certainly would have loved something like this when I was that age.
It looks like Amazon.com is currently offering a discount on the first month of the service (i.e., $11.00 instead of the usual $19.99), so that might be worth a look.