-The Bible. It’s the Word of God. The Truth.
Me: Written by MEN, over thousands of years, translated dozens of times, parts removed...
-But inspired by GOD!
Me: But written by people. And it’s not true. At best, it’s mythology or allegory.
-What? No, it’s TRUE!
Me: Prove it.
-I don’t have to, I BELIEVE it.

"But there must be a god because everything has an opposite, so there must be an opposite for the devil."

I didn't bother arguing, since the person using this one was clearly too stupid to understand that as I don't believe God exists it's not very likely I believe the devil exists either, and it's impossible to argue with anyone that stupid.

They claim that because the universe is so large and awe-inspiring, there must be a maker . . . . . so then you ask them, well, if it requires a maker, does that not mean that the maker must have a maker, and that maker have a maker, and so on ad infinitum?

Do you mean the Judeo/Christian god ?. I can see a good argument for not believing in it. Just read the first books of the old testament. An obscure middle eastern tribe are chosen by the creator of the universe to be his chosen people and he then helps them to defeat their enemies and take over lands he promised to them.
Actually a polytheistic tribe adopt monotheism whilst in exile in Babylon, possibly taken from Zoroaster and they then use this adopted god to justify their warlike acquisitive behaviour

But they're all so bad...probably pascals wager, since even homer Simpson sees through that one.