Scientists agree that the universe started with a big bang. What stumps them is how all the matter and energy of the universe came into being and exactly what crammed it into the space of a marble before it exploded.

Philosophers throughout history agree that anything with a beginning must have a first cause. The first cause for the beginning of the universe is what we call God.

It has been billions of years since the big bang. If the big bang had been slightly more forceful, then in the billions of years that have passed, everything would have expanded to the point that no particle would be in sight of another particle. There would be no planets, stars, or galaxies.

On the other hand, if the big bang had been slightly less forceful, then by the present time, gravity would have slowed everything down, and everything would have returned to the center. We would just have a big hot mess, and again, no planets, stars, or galaxies.

Knowing the correct amount of force at the beginning shows that God is a great mind.

There's a lot more to this. Read Lee Strobel's books.