One presupposition of cosmological arguments for God's existence is the axiom that nothing comes from nothing.
Unsurprisingly, in order to attack cosmological arguments, some atheists deny the axiom.
However, to deny the axiom is to deny causality. If something can come from nothing, then you have uncaused effects.
But that instantly dissolves many things that atheists typically hold dear, like induction, the uniformity of nature, and scientific explanation.