The logic behind suicide being a mortal sin is that you're telling God "Fuck You, I'll do what I want, not what you want."
According to most religions, God will call you back to him when he sees fit, not when you can't handle a bad day and decide to end it. The reason that mentally ill people don't go to hell is that to be a mortal sin, a person has to 1: Know it's a mortal sin, and 2: freely and willingly choose it. If someone is seriously ill and can't think rationally, and kills themself, they didn't freely nd willingly choose it, and most likely had their judgement clouded to the point where they didn't know it was wrong.
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