To understand christianity one must have an understanding of religion. And to understand religion, one must have an understanding of psychology. And to understand psychology, one must have an understanding of anthropology…very well then, here is a
very rough sketch that I put together.
The modular view of the mind is not a particularly controversial conceptual model for lower level cognitive processes such as sensorimotor coordination. There are different subsystems in our mind, each of which serve a different functional purpose. Sometimes these mind modules even act together in unison or feed off of one another.
The more controversial, yet perfectly reasonable position is to extend the concept of mind modules to higher level cognitive processes. Over the past few decades this line of reasoning has spawned a novel approach that has produced remarkable results with impressive explanatory power.
A great deal of our conscious experience is produced by mental machinery that operates below a level that is available to conscious introspection. Fully functioning adult humans are fortunate enough to possess the innate infrastructure that allows them to develop their social intelligence. This social intelligence requires the ability to take on the "intentional stance" whereby an individual can entertain the possible mental states of others; such as their thoughts, beliefs and desires. In contrast, autistics, to varying degrees, are deficient in terms of their social intelligence. What researchers have become progressively more convinced of is that autism is indicative of underdeveloped mind modules that specialize in "theory of mind". (it is my opinion that unlocking the mysteries of autism may also provide insights on how we can create a "human level AI")
So, we have these mind modules that allow us to take what Dennett has coined the "intentional stance". But why? How did these mind modules come to be and what fitness advantage did they convey?
Well for starters, homo sapiens' evolutionary fitness was clearly not conferred by its superior morphology (though I suppose opposable thumbs should count for something) – compared to most of the natural world we're slow and weak creatures! No, our evolutionary advantage came from our intelligence which was largely, though not entirely, focused on coalition building and social cooperation. This type of fitness – which enhanced the collective human gene pool's ability to perpetuate itself in the natural world – can be conceived of as "group level fitness". Eventually the development of human intelligence reached such heights that it largely removed the human species from the selection pressures of the “natural” world.
However, it is in each and every gene's evolutionary interest to perpetuate itself forward, and with some interesting exceptions, there is a generally cooperative relationship between genes that share the same vessel (ie, organism, "us"). This reality means that there is a separate level of selection known as "organismal selection". And as Steven Pinker pointed out, the most serious threat to an individual human's ability to perpetuate its genes into the next generation were – other humans! Thus, there was a general correspondence between human cleverness and fecundity, with the result being an intra-species cognitive arms race that included the enhancement of social intelligence.
One of the fallacies of strict adaptationism is the belief that
all qualitative aspects of biology must be accounted for according to the fitness value they confer. To illustrate this point, take the redness of blood (I believe this example was used by Gould in The Structure of Evolutionary Theory). The fact that there is a change in the conformation of hemoglobin when exposed to oxygen, and that this alters how the molecule absorbs light,
is the reason that our blood appears red when we cut ourselves. Blood itself is a direct product of biological evolution, but the qualitative aspect of redness has nothing to do with “fitness” – it is selectively neutral. (The concept of selective neutrality was also developed by Kimura with his neutral theory of molecular evolution). These selectively neutral characteristics of the phenotype were coined by Gould as
**Spandrels**Now as most our us are well aware, evolution is a very resourceful process and it will use any materials available to it to optimize fitness – including phenotypic spandrels. Unfortunately, this sometimes makes reverse engineering biological designs difficult, if not impossible, because the previous selection pressures can disappear and be replaced by new selection pressures which build on top of the preexisting organic design (thus “burying” the original evolutionary logic), but I digress. A simple way to conceive of this somewhat haphazard design process is to think of the evolution of the wing. Originally a wing was a limb. The limb evolved for terrestrial locomotion. Then somewhere along the line the selection pressures changed and acted upon (used as material) the existing morphology to design the wing for aerial locomotion.
The phenotype is defined as the morphological and behavioral characteristics of an organism. The social interaction produced by human psychology are behavioral characteristics that correspond to inference systems (a type of module) in the human mind. As such, inference systems were designed by the same mechanism of natural selection as the rest of the biological world.
At its most basic level, religious representations are a byproduct (a spandrel) of inference systems, such as those that handle human agency and social exchange. The over activity of the human agency representation inference system is the reason why many religious notions are anthropomorphic, such as Elijah repeatedly referring to God as a “he” (can someone please explain to me why God needs sex organs?). A nonveridical representation which does not have an affect on fitness may continue to exist indefinitely, especially if it is co-opted to deal with other psychological needs.
Combined with this misfiring of inference systems, are violations of our common sense notions of conceptual categories, which results in “salient memories”. For example, thoughts such as walking through walls, turning wine into blood and the virgin birth are all likely to stand out and be remembered by the average mind – precisely because they are violations.
Like everything, religious thought has evolved over time. More primitive forms of religion can still be found in the undeveloped corners of the world and are known as animism. The specific beliefs of the numerous strains of animism are extremely diverse and vary greatly over short geographic distances. This amorphic characteristic of animism is a consequence of the undeveloped cultures which it exists within lacking external data storage technologies. Without a means to “solidify” communal beliefs, animistic memeplexs have a difficult time remaining stable and are often changed drastically by “high salience” memetic mutations (produced by over active inference systems in individuals) that are adopted by the community as a whole.
On the other hand, modern religions are highly codified. This was made possible because of the literate guilds that arose with the advent of writing. And not only have religious notions become codified, they have also become more complex because external “communal” data storage allows individuals to more easily work with the data, both individually and collaboratively through either discourse or debate.
In regards to morality, it is a product of the natural dynamics of human evolution. It’s plainly obvious that intra-group cooperation was “good” for the group's survival. The advent of moral intuitions which favor cooperation should therefore come as no surprise. Religious representations simply conform and often co-opt moral intuitions (sadly, they usually restrict further analysis of moral dynamics as well), plus their presence may have been used occasionally to measure “defection probability” (ever wonder why mainstream America considers atheists to be the least trustworthy demographic?) Viral religious memetics attach themselves to aspects of human psychology such as morality because of what Boyer calls “aggregate relevance” – IOW, concepts that have maximal appeal to archetypical human inference systems and human emotional responses will be assimilated and passed forward from one generation to the next.
And that, in a nut shell, is why modern religions such as Christianity exist. They are an accumulation, codification and extension of false mental representations which are often salient because they violate common sense intuitions. Of course, it is a much much more complex issue than what I’ve written here, but I’m just trying to give a brief over view for those who weren’t familiar with the evolutionary psychology of religion.