Stump the Christian?

[Ravenshire]

What is your evidence the universe did?

I'm no expert, but the following information is easily found with Google:

The Second Law of Thermodynamics suggests that the universe is running out of energy and that a universe which had no beginning would have run out of energy already.

 
Additionally, three leading cosmologists, Arvind Borde, Alan Guth and Alexander Vilenkin, have proved that any universe which has, on average, been expanding throughout its history, cannot be eternal in the past but must have an absolute beginning. This also applies to multiverses – if there is such a thing. Vilenkin said,
 
“This means that scientists “can no longer hide behind a past eternal-universe. There is no escape; they have to face the problem of a cosmic beginning.”

So, you've found one of the competing theories. Good for you. Here's another.

The fact is, no one knows. Scientists, unlike the religious, are not trying to make absolute claims where they know the evidence doesn't support them.