The supernatural has nothing to do with love, hate, greed, altruism, bigotries, lust, abuse, compassion, charity or etcetera. As Edward FitzGerald's Omar put it ─
The revelations of devout and learn'd
Who rose before us and as prophets burned
Were all but stories, which, awoke from sleep
They told their comrades, and to sleep returned,
Because in fact, the supernatural is indistinguishable from the imaginary / purely conceptual, and has no more or less influence on human behavior than the imaginary / purely conceptual can have.
I've already drawn your attention to the role of identified biochemicals in human thinking and conduct. I've pointed out that 'lust' is associated, both in males and females, with testosterone, and with adrenaline. Love in the various senses of human bonding is associated with oxytocin. You need to get to understand about evolution, and where scientific and medical research is up to regarding human biology and psychology, and what research has shown to date about the structure of the human brain, the relationship of its particular areas to particular functions, and the interplay between those areas ─ and also the constant interaction of the brain with the body's hormonal system.
I speak as an interested amateur, but a great deal of hard information is out there. You could start with Wikipedia's article on
the brain or you could look around for something more basic.