I see the point you are making. However, it's not ridiculous to claim the possibility of one over the other. If there is a God, if there is a specific world view that has implications on the after life, if we are called to live one certain way that is right, then we shouldn't dismiss the possibility of that simply on the basis of a bad argument.
I don't see why we can't. Dismissing a bad argument seems like an extremely logical thing, no? Why let a bad argument persist? It's like a pimple - it doesn't do anything but annoy the living hell out of you.
I bolded some choice words because they illustrate my issue. Religion is based on belief and (essentially) the purpose of making somebody feel better about their lives. No one wants to believe there's nothing after we die, because a lot of people get depressed by that and want to have meaning in life. To fill this void, people turn to religion. Again, however - the idea that one is better than the other (which is purely bigotry) is a problem. It's a shroud of doubt.
Then, when you apply religion to suicide, it's interesting to note that every religion has a different take on it. In reality, no human life is better or more worthy than another life. So, how is it then that some religions see suicide as a good thing in certain circumstances? What makes them wrong and you right, or you wrong and them right? Nothing. So, we fall back on the "possibility?" It's a reasonable solution, but only if you accept the possibility that anything is possible. If you can accept the possibility of God in the same way that you can accept the possibility there isn't a God, then there really isn't an issue.
The problem, however, is that most theists can't/won't accept the possibility the God they believe in doesn't exist. An obvious counter is whether or not I can accept the same possibility of there being a God as there not being a God. For me, the answer is easily yes, because I believe in "God", just not the religious interpretations of him. At the same time, I can easily accept there isn't one.