Psychology had to be a science studying behaviour and mind of living beings.
There is a separate part of it studying specifically human behaviour and mind.
However, there is absolutely no any definition of how exactly human behaviour and mind different from non-human ones and how to separate one from another.
So, psychology can't even give an answer to the very basic question that obviously should precede any further study - is some person mind and behaviour human or non-human?
Psychology could have been very useful instrument to detect those with non-human behaviour and mind among us with scientific precision, but it was purposedly turned into pseudoscience bullshit to not even allow that question.
Yes, that's an important distinction. Psychology is based on humanism - the subjective human mind (more like brain and senses, because there's no mind/brain distinction in the naturalist view) is at the center of everything. They can't distinguish between a limited subjective human mind, that is made in the image of God, and the universal omniscient mind of God that grounds all knowledge and that is ultimately what our minds correspond to and appeal to when making absolute truth statements about reality (like 2+2=4, laws of logic, laws of physics or "all x are y" propositions).
The scientismo crowd has no grasp of serious philosophy (including philosophy of science) and how their lack of such a universal quantifier ultimately makes all knowledge impossible, leading to epistemological nihilism.