Well I've held off as long as I can, but I finally must succumb to the alluring topic we have here in this thread...I'll start with the "34 page disclaimer" that what is to be said here may have been said before...and I don't feel like reading 34 pages to find out...
I first would say that in my opinion, religion is not really a choice per se as much as it is the product of life experience...you don't choose to believe in God as much as you are simply convinced one way or the other by your own personal life experiences...
I mean, think about...really think about it...you can't sit yourself down and say "Well, today's gonna be the day I choose between atheism and theism"...you either believe or you don't...your beliefs may change over time, and some can even point to a specific moment (or series of moments) that led them to their belief system today...but it was those moments, those life experiences, that caused you to "buy into" a certain worldview...
That is not to say choice is irrelevant...you can choose, to a degree, what life experiences you are exposed to...additionally, you can make choices or take actions that happen to lead you down a certain path...but in the end, religious beliefs are products of life experience, not the results of a definite decision...an "epiphany" or "moment of clarity" simply is not a choice as much as it is an event you experience...
I am sure many will disagree with this premise, but there's my thought on the matter...now, with that in mind...
Why do these debates always turn into "Atheists vs Christians"?
I understand your point is more on why other religions are seemingly disregarded, but that really is more just the demographic of people on these forums (and I'd guess most discussions you/we are exposed to) than anything else...the real debate is between atheists and theists, and it equally concerns all religions (most of which just aren't proportionately represented by the community here/there/anywhere)...
Because religious beliefs (and one's willingness to accept or reject them) are the product of a life's worth of experiences, individuals are not easily swayed....of course this is obvious, we all went into this discussion fully aware that very few people here are going to change or be dissuaded from their beliefs...
But it is more than just "strong beliefs"...both sides are built on fallacious arguments with flawed thinking...it is an irreconcilable debate that can perpetuate itself with circular logic, semantics, and good old stubbornness...before you read too much into that and assume a tirade of flaming will follow, this statement is not meant to be offensive or critical in anyway....
In the end, such flawed thinking is unavoidable because we are human...the human mind inherently uses heuristics, confirmation bias, and defense mechanisms that heavily influence our beliefs...ultimately, neither atheists or theists have a single damn good reason to believe what they believe...really, neither side has a leg to stand on...advocates of each side ultimately have been "convinced" their side is right...there was no proof, merely evidence and a series of experiences vetted through the flawed human mind...and the product is an unshakable human belief system...
That doesn't mean we are wrong to have beliefs, or wrong to try and justify them (whether to ourselves or to others)...furthermore, just because the so-called "reasoning" behind a belief system is fundamentally flawed doesn't mean the belief system cannot possibly be right...there is no true solid, incontrovertible proof for atheists or theists, and eventually both sides will have nothing but "faith" going for them...your ignorant and unfounded beliefs are just as silly as mine are...
Barring the possibility of posthumous consequences, that someone is a theist or atheist is honestly irrelevant...a person's beliefs only need to serve that one person and their psychological needs, and both view points are quite adequate in satiating our intrinsic desires (in fact, agnosticism or apathy can fulfill those needs just as well)...clearly, what belief systems works best at "convincing" the human mind depends on which human mind we're looking at....
For the record, and because I think it's only fair people understand where I stand before progressing to properly criticize me, I strongly believe in God...and, I'll be the first to admit I don't have a single good reason to, I just do...I could point to reasons why I have been led to this belief, but ultimately there are no solid reasons why my belief is right or preferential to any other belief...
That being said, I think there is a big difference between the universally flawed thinking humanity depends on to live happily with itself and some of the thinking that is expressed here in this thread...in these types of discussions, I generally find both sides to be equally ignorant, illogical, intolerant, and shameful...I'm not saying all people who participated here are "problematic" or "antagonistic"...I simply am equally repulsed by hardliners from both sides...what bothers me the most about this type of debate in particular is that both sides commonly denounce the other side for being "intolerant", "ignorant", or "illogical"...in truth, I find both sides to be equally bad, going far and above the inherent bias and poor logic all human minds are plagued with...truly, these debates go to a whole new level of.....of, well, silliness...