But you said I have one:
''What matters is the logic of your argument.''
As there is no logic to it, it's not an argument. It's a misuse of logic and reason. You pick a single example
Because it was essential to this particular suicide.
Let's grant that this is true. What bearing does it have on whether religion is a form of harmful indoctrination? Well, if we look at general statistics we find that in general religion is a check against suicide. So the example is pointless.
But WAIT! There's more. Because you get a twofer here. Not only is the example a fallacious appeal, but the logic behind it's use is flawed. Clearly, the child seems to have chosen suicide via reasoning regarding a religious concept. Only this says nothing about whether or not we should teach children notions like heaven unless what the child did was consistent with what the child was taught. After all, it's possible to learn all sorts of things the wrong way and come to harm. If this is simply a matter of the child be taught incorrectly than it is the teaching
method (or lack thereof) not the doctrine or concepts. And what do we find? That Christians don't teach suicide is a way to be reunited with loved ones in heaven. In fact, most of them adhere to doctrines in which one will end up in hell for this choice. So even if we were to use this ridiculous emotional appeal as a basis for anything, all we could validly conclude is that the child learned the wrong lesson and it was the lesson or teaching which is to blame not religion. You get two fallacies for the price of one: emotional appeal and category error.