[Serious] Criticism of Aquinas' First Way or of the Proof of God from Motion.

[Belacqua]

Fine, correct me.

The word means "indivisible." It means the smallest thing that can't be divided down into something smaller. As such, it has nothing to do with what modern people call atoms, because we know these are divisible. The Greek word and the English word refer to different things. 

The fact that we know more about physics now doesn't invalidate the metaphysical arguments. 

Anyway, this not a part of a Thomistic argument, so it's off topic.