Nothing finite can be infinite (eternal). Since the universe is made of finite things (matter, time, space), it therefor must be created by something without time (timeless), thus making it eternal. If it is eternal, it must be infinite, and if its the Creator, it must be God.
The universe changes, and time is the measure of change. How many changes have happened before right now? If you claim an infinite number of changes (which is impossible because you can not have an infinite amount of finite things), it is a logically impossible to conclude we could ever have reached this moment in time. In a world of cause and effect (which we live in), there can not be an infinite regress (an infinite amount of cause and effect reactions to get to a certain cause).
Allow me to rephrase. Imagine that the Earth orbits the sun every 365 days (it does). Now, on Mars, a year is much longer than an Earth year, being 687 Earth days (basically double). So, for every 2 years of Mars, Earth has circled the sun approximately 4 times. Now, imagine that this has been going on for eternity. By your logic, they would both have circled the sun the exact same amount of times, because its been going on forever (this is clearly impossible). This shows the impossibility of an infinite regress, whereby there could not have been an infinite amount of (x) before right now, in a finite universe based on time.
Now, back to God. God exists outside of time, in Eternity. God created time, and time is irrelevant to Him. God is Eternal, not created. Firstly, you have 2 choices; either everything came from nothing (which is impossible), or something always existed and created us. You have no other choice. Take a moment to think about that, remembering that it can not exist in time, that would be impossible. Time can not be eternal.
This thing that always existed would be considered Eternal, having transcended time, space, and matter, being everlasting, having always existed. If you argue this is impossible, I would argue the contrary; it is impossible for this Eternal 'thing' to not exist, because the alternative is that nothing existed, which could only produce nothing. So, something always existed, and is therefor Eternal.
Now, for something to be Eternal, it can not consist of time, because time must have had a beginning. We exist in a universe of causality, so an infinite regress is impossible; there could not have been an infinite amount of time before right now, because we never would have reached this moment in time. That means time had a beginning, and whatever created time exists without time, beyond time, in timelessness; Eternity.
So, this Eternal Creator, created time, and the universe. This Eternal Creator clearly is extremely powerful, because the energy of the trillions of stars in the known universe were created by this Creator. And obviously, the Creator is extremely intelligent, having created an intelligent being such as mankind and a world in which to populate with it