In Defense of the Kalam

[Mudhammam]

The universe began to exist.
Everything that begins to exist has a cause.
Therefore the universe had a cause.

I read it in a book somewhere so as far as I can tell, it's a true argument.
Yes, people have tried to refute it a thousand times, but none of these attempts, according to the book I read, have been successful. So anyone who thinks this argument is false, please tell me why because I'm too lazy to actually do my own research.
Avodaiah

Fixed.