Am I a Deist? Cosmological Argument seems reasonable to me.

[ApeNotKillApe]

Also, the cosmological argument is self-defeating. If a god can exist without a prior cause, then why can't the universe?

This is one of the classic refutations that I just don't think it holds.

A god could come to existance without a prior cause because he would be able to do godlike shit like creating himself or some other magical and non-sensical stuff that natural things just can't do (or at least wouldn't be reasonable to expect they would)

You're excuse is magic. Non-sensical magic. Operating on a preexisting temporal plane. Orchestrated by a disembodied humanoid mind.

While an universe coming into existance without a prior cause doesn't really make sense (not saying its impossible but I just don't think it would make any sense for it do suddenly come into existance)

You're thinking of the origins of the universe in linear terms, in terms you as a resident of the universe naturally gravitate to. That you think of a god as inherently temporal (engaging in self-creation etc.) speaks to this. There was no 'prior' to the universe, the universe didn't pop out of some previous state of non-existence because non-existence doesn't exist.
The laws of cause and effect apply to the universe, they don't apply to nothingness because nothing applies to nothingness because nothing doesn't exist.
If you were to travel back in time, the big bang is as far as you could ever possibly go.