Atheist Asks a Christian "Where Did God Come From?" - The Answer is Pretty Good

Where did God come from?
The God of the Bible is not affected by Time, Space or Matter. If he is affected by time, space or matter he is not God. Time, Space and Matter is what we call a Continuum -- ALL of them have to come into Existence as the SAME Instant.

If there were matter but no space, where would you put it?

If there were matter and space but no time, when would you put it?

You cannot have time, space or matter independently to come into existence simultaneously. The Bible answers that in Ten Words: "In the Beginning (Time), God created the Heaven (Space) and the Earth (Matter)."

So you have Time, Space, Matter a Trinity of Trinities -- Time is past, present, future. Space has length, width, height. Matter has solid, liquid, gas.

You have a Trinity of Trinities created Instantaneously and the God who created them has to be Outside of them.

If he's limited by Time, he is not God.

The God who created this Universe is outside of this Universe - he is above it, beyond it, in it, through it and is unaffected by it.

The concept of a spiritual source cannot have any effect on a material body, what about emotions like love, hate, envy.

If your brain is just a bunch / collection of random chemicals that formed by chance over Billions of years how on Earth can you trust your own reasoning and thought processes?

So the question of: Where did God come from?

It is assuming a LIMITED God. And that's your problem, God is not limited by time, space or matter