p1. Everything that begins to exist has a cause of its existence. (Causal principle.)
p2. The universe (space, time, and matter) began to exist. (Evidenced by two philosophical arguments, the Big Bang, and the second law of thermodynamics.)
c3. Therefore, the universe has a cause of its existence.
sp1. As the cause of the universe (space, time, and matter), the cause must be outside of space, time and matter, and therefore be spaceless, timeless, and immaterial. Moreover, the cause must be a personal agent, otherwise a timeless cause could not give rise to a temporal effect like the universe. (Argument expanded.)
sp2. This is an accurate picture of God.
sc3. Therefore, God exists.
It states that the universe must have had a beginning because "infinity cannot exist in reality", but then how can God exist?