When I was a teenager my very Baptist father told me that I didn’t have to believe what the preacher said, that I could believe anything I wanted to believe.

There are shades of grey.

Yuck

I think a lot of singles don't know the meaning of "free thinker" or even "agnostic" so maybe don't take characterizations of themselves to literally. Many women like to think for themselves on many issues, outside of religion, and that's likely what she means.

Maybe they don't charge any money, when they do the thinking for you, before they tell you what to do.

It may be a small difference, because in my experience, most women are willing to tell men what they should do for free, but they don't usually promise to think first.

They are free to damn you to hell