I was raised without religion. Decided I was atheist as soon as I came across the word as a kid.

I've read large parts of the Christian Bible, in a "know thy enemy" sort of way.

Also, reading the Bible is one way atheists come to be atheists.

That said, I have zero interest in learning more about astrology. Yes, it's completely nonsensical, and not worth anyone's time pursuing. There's nothing behind it. The "basics of how it works" is that it obviously doesn't work at all. It's complete bullshit.