Atheism and morality

[Inigo]

If there's an afterlife then your current life doesn't end with your death. It continues. You don't get to not exist.
So, you do not just have mortem interests, you also have post-mortem interests.

But then why does there have to be an afterlife because of morals? Why could the person issuing the demands not be a supernatural being in charge of our current lives, with no afterlife.

Because the rational authority of the instructions of such a person would not be inescapable. You would only have reason to comply with such a person's instructions so long as you stay alive. if you were planning on, or about to kill yourself/die you would have no reason to comply with this person's instructions to you.
Moral instructions are not like this. Moral instructions are inescapably rationally authoritative. Only the instructions of an agent who has control over our interests in an afterlife would be like that.

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Instructions don't require an instructor. They can be contained in a code that is read through already existing patterns. We call these the laws of physics. The code itself is written through already existing patterns. Chemistry/Physics what have you. You keep saying instructions require an instructor when obviously you know nothing about what an instruction is. Keep on asserting an instruction requires an instructor. A code does not require an instructor, only the correct sequence of events. Obviously you skipped over the part about instinct and neural blackmail. These are examples of instructions which we do not necessarily have to follow.

Just nonsense. the laws of physics are not instructions. You're not 'instructed' to obey the laws of physics, are you?! They describe how things behave, they do not prescribe.

Instructions DO require an instructor. Provide me with an example of one that doesn't have an instructor or shut up.