"“Further, neurological research indicates that a particular part of the brain is connected to religious experiences."
True. The same portions that are involved in temporal lobe epilepsy, if I recall correctly. The psychological experiment of stimulating various parts of the brain with electromagnets, which disrupt the normal electrical activity of the brain slightly, often produce effects that subjects describe as "spiritual."
"Perhaps atheists are the product of a genetic deficiency or disorder and if so, one can only wonder what else is wrong with them."
The evidence would seem to indicate it is you who have the brain that doesn't work quite right, not us.
"After all, most atheists seem to suffer from delusions of grandeur, convinced that they hold the keys to humanity’s march toward utopia."
I think no such thing. First of all, Utopia isn't going to happen. Not for a very, very long time at least. Humans are genetically predisposed to too many nasty habits (tribalism among the worst) that prevent us from working together for the good of everyone and not just our particular little group, be that group a family, group of friends, neighborhood or an entire country.
Second of all, Utopias would be terribly boring, I would think.
"They are also quite happy to embrace programs to “improve” humanity to suit their own purposes hardly a coincidence, one would have to suggest, that the most repressive regimes of recent days have all been formulated along atheistic, humanist principles."
Now you're just spouting nonsense.
"One can only hope that the possible link between atheism and mental illness is examined honestly before countless others suffer needlessly."
Again, religion is more akin to a form of mental disorder/illness than atheism.