[blowfish]

Machines are created also.

You know this how? And you have a better candidate?

[aMorePerfectUnion]

blowfish,

Certainly you know this, but machines are not self-reproducing. And even if they were, they wouldn't qualify as a first cause since they are inside time and the material world. Only something outside time and the material world could be a first cause. But then, you knew that. :-)