This forum is truly dreadful in the speed at which the debate descends into abuse, so I am probably going regret this but here goes.
I tend to agree that the case to be made is not necessarily for atheism, but rather whether anyone can demonstrate the argument for a single religion.
The probem, as I see it, is as follows:
1) There are many good, decent people who believe in a religion to the exclusion of others (Religion A).
2) There are many good, decent people who believe in Religion B, to the exclusion of Religion A with which it is incompatible in some way.
3) Both implore me to follow their religion, or face serious eternal consequences.
4) How do I then choose? Overwhelmingly people will 'choose' the religion of their parents, but that suggests that religion is simply determined by the casual chance of birth, which is unsatisfactory.
5) If I choose the religion that simply accords with my own moral beliefs, then surely I am not following that religion, as to follow any religion must necessarily imply that I will, from time to time, act against my natural inclinations to follow the teachings of that religion. But, if that were the basis on which I chose the religion in the first place, I might simply find another religion which is a closer match.
6) The alternative is to accept that all religions are manifestations of the same thing, and that their incompatibilities are just what happens when human beings argue over centuries over these types of things.
7) If that is the case, then you may as well accept that no religion can be selected which you can be sure is the right one. So you select none. After all, if you are going to be damned, you would surely prefer to be damned for what you believe in that what (in your heart of hearts) you don't.
8) For my personal perspective, this leads me to conclude that I should simply lead a good and moral life. I have not expanded on what this means to me for the simple reason that it is only my view that matters, as I do not chose to submit myself to someone else's teachings (though I will take elements of them on board if I feel they are valid).
9) This, of course, could lead you to the conclusion that, whilst you don't follow any single religion, you should nonetheless believe in a god.
10) However, in the absence of a specified religion, you would have no prescribed basis to determine what type of god this is (e.g. compassionate, vengeful, proud etc.) At this point, you are back to stage 5, in that you would probably visualise a god as being someone who shares your moral values.
11) If this god were a being that would damn an otherwise decent human being for the simple chance that they followed the religion of their birth, were homosexual, committed adultery etc, then this is not a god I can accept as being a god. In fact, I believe that a true god would not punish an otherwise good person even if that person denied that god's very existence.
12) So I am left with trying to be a good person, look after my family, try and do no harm to others etc. I cross my fingers and hope that, if there is a god, this will be good enough. If there isn't one, I have lost nothing, which I might have done if I had followed the 'wrong' religion and acted against my natural inclinations by following its teachings. I don't need to deny god's existence, because I don't see it matters whether I do or do not.
The only thing people who do follow a particular religion can do for me is not to explain to me why their religion is right, but to explain how they reach the conclusion that other religions must be wrong, other than to say "it just is", as proponents on the other side will say exactly the same thing and are often just as well-intentioned.