Theism

[Andúril]

(1) I don't believe in myself.
(2) Therefore, I don't exist.

Unstated premise:

(a) If I don't believe in myself, then I don't exist.

Premise (a) is invalid. The premise can be true and the conclusion false at the same time, i.e. you exist, but you are insane^99, so you don't believe in yourself.

It is also weak, because it is not extremely likely that 1 and 2 are both true at the same time (which would make it a strong invalid argument), rather the likelihood is less than extreme.

You have a bad argument.

But ofcourse, you need to adequately define "me", and "exist"

Note: If anyone has completed any BA logic modules (or can point out the nonsense), please have a go at me. I've just started a BA, and I need all the practice I can get...