A simple challenge for atheists

[robvalue]

I am not seeing the argument "failing hard". I agree, it only proves that something caused the universe.

That is failing hard for someone who is trying to prove a "god" exists, and even more so if they want to prove their personal favourite. I don't know of any theists (except maybe deists) who would stop after the Kalam and just say, "See! Something." Because it has nothing to do with their point, even if the argument was valid, which it is not.

God is a useless word. It's entirely imaginary. No one, as far as I know, has ever given a meaningful definition of such a thing, so that we'd know it even if we somehow had some experience of it. Presuming that anything that "created" a reality also has to have maximum possible power is a huge non-sequitur.

The whole thing is an argument from ignorance. Science doesn't yet have the answers, so the cause must be "something", and what else could it be than "god". Not very good.

No one believes in god because of crappy arguments like this, they are rationalizations of already held (probably emotional) beliefs.

Science doesn't try to describe what happened "before time" because it is nonsensical. Unless further evidence is found, we are stuck not knowing if it even means anything. And that is fine. Making up answers does not help.