A defeatist is a person who gives up. Look up a word, before you try to be snarky when using it.
Your statement was a defeatist statement. You stated it was beyond our comprehension. That is what a person who gave up on trying to understand says, which is a defeatist action.
The point of science is to try to figure out things. If mankind thought like you, we would not even have this computer you are using to push your ideas of defeatism on. So I don't accept the idea that mankind can't ever understand a subject that mankind has the ability to study. You thinking something is beyond human comprehension is just you expressing that it is beyond your ability to comprehend and so you imagine that it is beyond everyone else's too.