It requires more in-depth unpacking, the basic structure of the argument is fairly simple but the background metaphysics to understand what is meant by terms and how it meshes together takes quite a bit of work; At least for me, it does. But in its simplest form, the cosmological argument is that what comes into existence has a cause, or that what is contingent has a cause. Which is different than everything has a cause.
Dr. Feser continues:
Lots of people – probably most people who have an opinion on the matter – think that the cosmological argument goes like this: Everything has a cause; so the universe has a cause; so God exists. They then have no trouble at all poking holes in it. If everything has a cause, then what caused God? Why assume in the first place that everything has to have a cause? Why assume the cause is God? Etc.
Here’s the funny thing, though. People who attack this argument never tell you where they got it from. They never quote anyone defending it. There’s a reason for that. The reason is that none of the best-known proponents of the cosmological argument in the history of philosophy and theology ever gave this stupid argument. Not Plato, not Aristotle, not al-Ghazali, not Maimonides, not Aquinas, not Duns Scotus, not Leibniz, not Samuel Clarke, not Reginald Garrigou-Lagrange, not Mortimer Adler, not William Lane Craig, not Richard Swinburne. And not anyone else either, as far as I know. (Your Pastor Bob doesn’t count. I mean no one among prominent philosophers.) And yet it is constantly presented, not only by popular writers but even by some professional philosophers, as if it were “the” “basic” version of the cosmological argument, and as if every other version were essentially just a variation on it.