All anyone agreed to, IIRC is that people can imagine what they think of as "god" in their minds. We never agreed that any god "existed" ie, that there was an actual god in anybody's mind.
A teenager can imagine that they are in love with a rock star they have never met and do not actually know. The teenager will also define the rocker as the supreme, the best, the one who rules, someone who can do no wrong. The teen might create an altar to the star, with pictures, memorabilia, autographs, etc. The teen might even think of the rocker as a god
and come to as close to worship as is possible!
Although they could not possibly be in love with the rock star, the same brain chemicals will be produced, just as if the teen was really in love, and the same strong attachment feelings will be generated. If the teen ever does meet the rocker, and the star acts very differently from what the teen imagines them to be like (is boring, or acts like a rude jerk, or ignores the teenager like a normal person would when encountering a total stranger) they will experience feelings of rejection and be very disappointed.
When (as has happened many times, if the testimony of formerly religious atheists is to be believed) a person realizes that there is no god, they will feel very disappointed and let down, just like the teen who finds out the rocker does not really love them, or even care about them at all. Eventually, looking back later, they will probably feel foolish and even angry that they were tricked into believing something so silly. Just like the teenager will probably feel foolish later when they have moved on emotionally.
Unless anyone can produce any evidence to the contrary, we have to assume that when a person says that they "love god", "god loves" them, they "feel god's love" in their heart, they talk to god, god talks to them, god is working his magic in their life, etc. they are experiencing the same kind of phenomenon that the teen with a crush on the rock star feels.
The "love" between god and the believer is as imaginary as the "love" between the rock star and the (I won't do it) bedazzled teenager. Neither can produce any evidence other than what they feel, and what they imagine the other is doing. In both cases, if the attachment becomes obsessive we might refer to the person as a "fanatic".