I homeschooled my kid k-12. When I started, I had no idea how many religious hs-ers there were. I used a secular curriculum, and never even thought about teaching anything regarding religion one way or another. Once I started looking around at all the creationist curricula out there--yikes.
Anyhoo, long story short, my son went on to a college degree (he actually started college classes online at 15--one of the perks of hs-ing for us), and he's an atheist. Secular homeschoolers do exist!
ETA some links--these are a few secular homeschool curricula. There's a lot more out there, but this is the majority of what I used through the years:
https://www.calverthomeschool.com/
https://www.oakmeadow.com/
https://www.keystoneschoolonline.com/
https://www.thinkwell.com/ (Primarily math--the professor that does most of the math instruction is wonderful.)