The First Cause? Prime Mover Argument

[Esquilax]

The argument that swayed me is very simple:
Premise 1) Everything in the Universe is either impermanent, or depends upon something else for its existence. (things are born and they die, the universe tends towards entropy, nothing within the Universe lasts forever)

Here's the problem: let's assume this is entirely factually correct. What you have here is a fallacy of composition: you cannot assume that what is true within the universe (especially within the extremely small visible portion of the universe we have access to!) is true of the universe as a whole, or of things beyond or before the universe. It's an unjustified leap of reasoning and also, I might add, a poor reason to stop being an atheist and to start being a deist, because even taking your entire argument as true there is nothing within it that establishes that your first cause is even conscious, which is kinda necessary for a god of any stripe.