This should be fun...<quoted text>
You cannot know anything absolutely unless you know everything.
You are an atheist and cannot, according to your worldview, have access to knowledge that allows you to account for anything.
Christians can know truths absolutely, because they accept the revelation of those truths from the one who does know everything.
But here is the kicker:
You do in fact, know much more than your atheism can account for.
You recognise absolutes, because you use them all the time.
You also know where they lead a person, so when it starts leading you to the place you cannot go, you have to deny absolutes.
That absurdity, of using absolutes and denying absolutes, reveals your worldview is actually nothing more than a desperate attempt to suppress the truth.
The Truth as revealed in the person of Jesus Christ...
You just don't like the truth, so you have to deny it...
What truths do Christians know absolutely?