Exactly—one anecdote about homeschooling doesn’t apply generally. In the US, the average homeschooled kid is likely to be raised in a very religious family with little to no science education.
The fact that homeschoolers in the US are likely to be religious also tells you nothing about homeschooling if done by someone who's not particularly religious and cares about science.
There are statistics out there about the academic performance of homeschoolers, and all the evidence out there shows that they have better academic performance than public school kids.