Because telling people that the reason they want to kill themselves is that they don't believe in God -- or are "seperated" from God, whatever -- is a perfectly acceptable form of trying to convert people...
I don't really agree; what if I posted a flyer just like that one, except I said that the cause was that there are too many terrorists alive, and the solution was to join the military? I think that would be equally immoral, and equally wrong.
The problem is with the way the information is presented. If you want to believe in a flying spaghetti monster, you have the right to do so - but you should not be allowed to preach it as fact. For example, evolution can be proven - it can be observed directly - but one can't prove that it describes where we came from, and therefore that it precludes intelligent design.
Of course, I've been known to drop the one-liner, "FOSSILS," in the midst of religious discussion.
I like the way Stephen Hawking described his notion of god. He explains that, for any given state of the universe, the following state is determined according to the laws of physics - the dimension that governs the transition of states is time. If you knew all of the physical laws, you could theoretically determine what the next state will be; but we do not know all of them, and there's a lot of calculations to be made for a universe so large in an infinitesimal time. Within the universe, there are four observable dimensions - three of space and one of time - but they do not exist outside of the universe. There can be an unbounded number of universes, but you can not say this "for any given time," as time and space are properties of a universe. It follows that for any state, there was a previous state -- that is, until you reach the point of time at which there could be no previous state according to the
universal laws of physics, the instant of the big bang. So, whatever force set the initial state of the universe will, "for convenience," be referred to as god.