Hello Tula,
I applaud you for your skepticism and critical thinking! After having been duped by JWs for so long, I'm careful to employ my critical thinking also. I wish I had been more like you before they came a-knocking at my door!
By way of explanation, I offer the following:
You had quoted as a "Zazen teaching" this:
"The wind moves but the mountain does not move" (etc.)
It seems to me that the above quoted is not a teaching (like the Four Noble Truths) but what is called a koan. This is a nonsensical-seeming saying that's used for meditation to be interpreted anyway the meditator can make any application. Some of them never do figure out a meaning (not THE meaning). I utilized one once; it went something like this:
A monk in training said to his teacher, "it's too hot!"
The teacher said, "why don't you go where it's neither hot nor cold?"
The monk said, "how can I do that? It's always hot or cold here."
The teacher said, "wherever you are it's neither too hot nor cold."
Or something like that! It was helpful for really exploring a thorny statement and examining it from all sides. I came up with several explanations and it was enlightening. Most Zennists and Buddhists don't utilize such meditation assists though.
All the best,
Pat