The Kalam Cosmological Argument NOT Debunked -- A Response To YouTuber Rationality Rules

I discovered a YouTuber called "Rationality Rules" very recently. One of his many videos is "The Kalam Cosmological Argument Debunked - (First Cause Argument Refuted)".  which you can watch here. One of my patrons brought this video to my attention and requested that I respond to it, so here we go.
For the uninitiated, The Kalam Cosmological Argument is formulated as follows:
1: Whatever begins to exist has a cause.2: The universe began to exist.3: Therefore, the universe has a cause....