Mr. Tree Shows Us How Irrefutable The Kalam Cosmological Argument Is

So one of the regulars decided that the best way to defeat theism would be to try and show how its best arguments don't work. Actually that makes sense! Find out what it is we actually believe and what evidence we use, and show how it is wrong. Good work Mr. Tree! Now you're working on our level!
Let's see how well he does.

Mr. Tree on this occasion has put together his explanation for why the Kalam Cosmological Argument fails.

 

It's great that he has no problem with P1. We're already agreeing on half the premises. So it's only P2 where there's disagreement.

2&3: Relies on equivocation, what do we rightly mean by ‘the universe’. The original arguments from which this is derived did not restrict themselves to asking “where did the universe that sprang from the big bang come from”. The ancient philosophers were asking where the world came from and working back towards the cause of all things, the universe, the totality of existence, reality.

Whatever the ancient people who used similar logic to the KCA were talking about is completely irrelevant to what we're talking about today. We might have taken some inspiration from them, but things have changed and we use the argument in its modern form.
If you're worried about definitions, then it's simple and it's no secret what we mean by the word 'universe'. We mean this space/time thing that started at the Big Bang, is expanding, and will die out in a heat death.
So no... there is no equivocation. We don't say 'universe' when we mean whatever the ancients were talking about.