To prove that love and other emotions are not a result of any type of god is quite simple:
If you take an anti-depressant, what happens? You are suddenly in a better mood.
If you take ecstasy, what happens? You suddenly love everybody around you, and if you have ever talked to anybody who has taken it, they will tell you "you just love everybody and everybody is your friend."
There is a drug out there that will enhance every emotion you have by stimulating certain receptors in the brain, and MRI's will show this.
So, does god live in our brain? You know what they say about people who have somebody talking to them inside thier head, don't you.