The other famous Christian thinker I mentioned in my joint talk at Speakers Corner yesterday is Søren Kierkegaard the famous Danish philosopher, theologian, poet, social critic and religious author who is widely considered to be the first existentialist philosopher (1813 – 1855). Kierkegaard had a major influence on Martin Heidegger and Ludwig Wittgenstein too.
He understood well the absurdity at the heart of Christianity:
What, then, is the absurd? The absurd is that the eternal truth has come into existence in time, that God has come into existence, has been born, has grown up, has come into existence exactly as an individual human being, indistinguishable from any other human being.
He could also have mentioned the absurdity of the idea that the eternal, immortal God died on the cross. The Bible is clear that God does not die, see 1 Timothy 6:15-16