Well I see religion as a common sense for those that don't know it.

The ten commandments (Minus the ones specific to God) would be the most important thing out of the bible. Don't be a douche is the summary, but not many would learn or teach that to themselves being idiots or others being idiots. Like "Hey, don't kill people for no reason. Don't steal. Don't be an asshole." Basically like "Humanities Government" where us humans can depict via that if you're an idiot or a decent human being.

Then the bible goes on, in my opinion, as metaphorical stories. Like the story being of God telling some dude to kill his son, then last moment says "WHOA, NO." I see that as a metaphor for no matter the highest of power should you ever kill because they told you to. Or Mag chic that was a whore and turns to Jesus and changes. Metaphor that no matter your lows, you can change.

Now. Not a lot of people see that way. There are some that do. Those that can, I consider as free thinkers. Not "Magdalene was a whore, and without Jesus she wouldn't be who she was."

My father is Presbyterian, and my mother is a "Baptist but the bible was written by stupid men who don't know shit". Neither pushed any type of biblical/religious stuff on me. My SO is Catholic and so is his family and they haven't either. The most they pushed on my son is Baptism. So I consider that free thinking, albeit small definition of such. Not every free thinker has to be philosophical, even acceptance of others is free thinking I would say. Especially since they're based on the idea of somehow indoctrination.

TL;DR 10 commandments are basic common sense. The bible stories are all metaphors and seeing it as such instead of the actual story, imo is free thinkibg. Also others being in a religion itself without judgement of others, or indoctrination, imo is also free thinking. Free thinking doesn't have to be a huge ordeal, even the smallest should be considered as something.