So we have elaborate theories to explain emotions, same as we have theories to why God exists.
If we are okay to blindly believe in emotions because certain scientists (the new priests) say so and we feel them though we can't touch them, and because everyone around the world decided that we must believe in emotions, why are we not ok to blindly believe in other things on more or less the same basis?
I have never seen my friends brain for example, how do I know my friend has a brain? Because science and everyone else says so? That's blind faith.