The Christian bible doesn’t condemn suicide. Most of the mentions were written in a period where society didn’t combine suicide with something inherently bad. Even in the more recent parts you can see Mathew praising the suicide or Judas because it was better than living with the guilt.
Obviously organised religions have found ways around what’s actually written in the bible, and you won’t have a hard time finding Christian’s who think that not killing includes yourself. That is an interpretation though, and unless God spoke to you personally to clarify it, then it’s frankly a lot worse for you to judge someone than to leave that sort or stuff up to God. Even if you are on some misplaced quest to save souls then Jesus already has you covered by dying for your sins.
Contrary to what you may think I don’t have a problem with religion, but I do think people who use religion to spread hurt are assholes. Considering that religious texts were written, selected and curated by people I frankly think it’s on the individual to interpret them. If your interpretation leads you to harassing dying people then you should stop and become a better person instead.