While it's true that the first section in the arguments against euthanasia is "Against the will of God", the others aren't. Arguments such as
* There's no way of properly regulating euthanasia
* Euthanasia exposes vulnerable people to pressure to end their lives
* Voluntary euthanasia is the start of a slippery slope that leads to involuntary euthanasia and the killing of people who are thought undesirable
* Proper palliative care makes euthanasia unnecessary
are not primarily religious and you will find them repeated several times here in various wordings. The argument "Euthanasia weakens society's respect for the sanctity of life" may be based on religious belief but I don't think it's a uniquely religious standpoint that life has some form of sanctity
Those arguments aren’t all religious but they are mostly very weak. It is properly regulated in places. Nobody is pressured into it. There’s no evidence or logic to support the idea that euthanasia is some slippery slope to concentration camps, in fact it’s been legal in places for a time and nothing of the sort has happened.
If I said “euthanasia leads to long lines at the grocery store“ it would be a no weaker of an argument than most of those.
Arguments like these may not all be directly religious, but they come from the same place.
I realize it’s just my opinion, but I’ve still never heard one intelligent argument against it.
