Just because the universe has a cause doesn’t mean that cause is God or the Christian God.
But even if we stick with this argument, we can get somewhere on our own steam. Like the video pointed out, the cause of the universe must have been spaceless, timeless, immaterial, uncaused, and immensely powerful. Not only is this suspiciously similar to the traditional conception of God, it might be asked, what other possible candidates are there?
What else might have these properties? The only thing that might fit the bill are abstract objects, like numbers, that don't depend on spacetime reality. But the problem is that they are abstract can't cause anything; it's hard to imagine "42" creating everything (even if it is the meaning of life in The Hitchhiker's Guide to the Galaxy).
So given the untenability of abstract objects, God is in fact the most reasonable explanation.