Evolutionary Theories of Religion

[Silver]

The most popular theories for why humans have religion are:
1. To answer the existential mysteries--Why do we die? What is our purpose in life? How did the zebra get its stripes, etc...
2. To increase social cohesion in tribes/groups

My question is, at least for #2, there are 1,000s of animals species that live in social groups and have perfectly adequate social cohesion mechanisms such as territoriality, dominance hierarchy, grooming, etc. Why would humans need religion to improve their social relationships when there are already abundant mechanisms and successful social species? For those of you who might be familiar with some of the theory of religion writers--Scott Atran, Pascal Boyer, Dennett, Matt Rossano, and others--I haven't seen anybody ask this question. Is this a valid question? Is this a valid question for #1? 

Number two is only a popular theory in modern society because religious people think meeting in church is the way to socialize.  They are stupid retarded.

The origin of religion is simple enough; man had no idea from whence he had come and he looked toward simplistic answers due to his limited resources.  It was natural to look at the stars and imagine that gods lived up there who created them.