Well, that's just the thing about imperialism... it works.
If you compare the population sizes of imperialistic religions to the populations of non-imperialistic ones, there is a huge disperity between the two. I think about 60% or more of the world's population is either Christian or Muslim, while the remainder are predominantly Hindu or Buddhist. Obviously there are other existing religions, but they're so underrepresented that they are statistically negligible.
When you compare the beliefs of the individual religions however, there isn't one that stands out as being more reasonable than the others. In fact, the two most statistically significant methods of predicting one's religion are "geography" and "religion of parents." Meanwhile, the two greatest predictors of atheism are "intelligence" and "education."
That's an interesting dichotomy that really begs the question of why religion is even relevant. Well, for all practical purposes, it is not. This is why imperialism is such a dominant force in the cultures of mainstream religious groups. By recruiting as many followers as possible, fundamentalists can cower behind the "ad populum" fallacy, which (in their minds) frees them of any accountability of reason. While indeed a fallacious practice, this "quantity over quality" approach works because a religion can easily exploit the uneducated or unambitious, simply by promising them utility in exchange for faith. Obvisouly, this "no thought required" approach appeals to these types of people, as it's far easier to just be given an answer right now, rather than committing effort and accountability toward the chance of finding a more qualitative explanation eventually. It also benefits the religion itself by "stacking the deck" with exactly the types of people who are incapable of, uncomfortable with, or resistant to the "research mentality." Unsurprisingly, these are exactly the same types of people who are likely to be oblivious of any logical ingongruities in their own arguments, and without the capacity, resources or ambition to rationalize beyond what they've been instructed to repeat.
Christians, as we've all observed, are completely uninhibited, even self entitled, when it comes to imposing their will upon others. Islam is more limited in its capacity to do this, because the religion itself prohibits blatant imperialism by being a self described "non-compulsory religion." However, while Muhammad stated explicitly that Islam is non-compulsory, many of his followers have found a loop-hole around it just like they did with his mandate for non-violence. In many Middle Eastern nations (where Islam is strongest) and some South Asian nations, men are allowed to acquire as many wives as they can afford to provide for. Also, since women are still considered property in many of these regions and are prohibited from making many of their own decisions, it is pretty much obligatory that each new wife adopts her husband's religion. Consequently, many Muslim men in these countries (such as India, which is 80% Hindu) prefer to marry "infidel" women, which I actually have to admit is quite strategic.
Unfortunately, these factors still provide religion with enough "fuel" to insist upon its own relevance, thus continuing a centuries long tradition of self-fulfilling prophecy. By comparison, an almost elite degree of intelligence or education is required before one has the capacity to independently rationalize whether God probably does or does not exist, which gives atheism a distinct disadvantage in the numbers game. In fact, the only "religion" that I know of that encourages introspection, logic and research the way most atheists do is Buddhism, which is a non-mythical religion and therefore enforces no belief in deities or the super natural. In fact, it doesn't enforce any specific belief at all, not even the belief that Buddha really existed.