Tentatively Christian; looking for a reasonable discussion

[Thumpalumpacus]

Alright, thanks for the encouraging welcome, everyone.

At risk of being quickly overwhelmed and outnumbered, I'd like to begin trying to better understand where you guys are coming from. With the understanding that I won't be able to adequately respond and address every person who replies, my first question is:

How do you guys refute the "Kalaam" argument? (some kind of supernatural, transcendent force or "god" must exist because of the necessity for a First Cause which is beyond matter, space, and time)

Here's how:

Everything that begins to exist has a cause;

Demonstrably false.

The universe began to exist;

Not yet known.

Therefore:
The universe has a cause.

Unsupported conclusion.