Very interesting analysis. Thanks.
As far as the "gay gene," certain behaviors (such as alcoholism, obesity and homosexuality) MAY have a genetic component. But it's not like eye color or height. It's a behavior. where the behavior has negative health effects, society generally discourages it.
What this guy is talking about in this book is human spirituality, not worship. Our spirit, soul, or whatever you want to call it is made in Gods image. (suprise! it's not our bodies which are created in Gods image) This is our "God" gene. It gives us our sense of right and wrong. Otherwize we would be animals and have no concience, which the Godless left wants to be.