Here is an example of presuppositional apologetics. Look up Greg Bahnsen or Sye ten Bruggencate to learn more. I’m not holding myself up as an example of a great apologist. My intent is just to show how easy it is.

When someone denies truth, they have shown themselves to be a fool and any rational conversation is over. This conversation kept going, but it was over the moment he said there’s no such thing as absolute truth. Here’s a conversation I had on Youtube.

Atheist: Got to say your god is the biggest tyrant to ever grace the paper. You claim obediance to a imaginary friend. And then say that your sense of morals are objective? Sad, really really sad!!!
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Me: So, would you say Christianity is false? If so, you must believe in absolute truth. Where do you get absolute truth apart from the God of the Bible?
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Atheist: Yes, and I can prove your god is nonexistant. Thats he is a malicious, genocidal, jealous, infantcidal oppressive prick. Absolute truth? No such thing. What makes you think anything in the bible is true?
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Me: You said, “Absolute truth? No such thing.”

Are you saying it’s absolutely true that there’s no such thing as absolute truth? It’s either true or false, right? What am I missing?
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Atheist: You can play word games and semantics with others, it wont work here. You are a idiot for having beliefs in imaginary, superstitious nonsense. Quit throwing up red herrings. I will call you out on apologist fallacies every time.
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Me: You said, “…it wont work here.”

But that’s not absolutely true, is it? Nothing you say is true, because you deny truth, right?
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Atheist: And what ‘truth’ would that be? And yes, if you pull WLC apologetic crap here I will annihilate you and your pathetic argument. If you got some actual evidence for your ‘truth’ then go for it or otherwise you really need to stfu. 
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Me: Truth is that which conforms to the mind of God.

Saying there is no absolute truth is self-refuting and absurd. Every sentence you type demonstrates the folly of atheism.
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Atheist: Every time you use the word god shows the ‘folley’ of theism and your wilfull ignorance and wilful servitude to a imaginary deity created by men to control the masses through intimidation and fear. One more question before I go. What is the worst sin of all? Doubt. LMAO If you doubt you will burn in hell forever. Good luck with your life of fear and slavery.
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Me: Before you give up, I’d love to hear you take a stab at explaining how it’s true that there is no absolute truth. I’m up for a good laugh.