[b800h]

> doesn't imply that there has to be some great power that created it

Ah but it does! There's lots of modern apologetics around this, not in the least the Kalaam argument, which go into it.

[bigbluedots]

If everything that exists has a cause, and a higher power that created the universe exists, something else must have caused it to exist. What caused God?

[b800h]

This is one of the ontological arguments for the existence of God. Any intelligible first cause must have a prior cause. Therefore the first cause is unintelligible. The thing which caused the universe is beyond our understanding.