If God exists and has miraculous and supernatural powers, why doesn’t he/she/it prove that he/she/it exists by performing a simple miracle that can only be explained as a miracle, the evidence of which is not only simple and salient but incontrovertible?
He could perform a miracle in which the 5-10 best known atheists now living all suffered a heart-attack or stroke at 10:13 AM on Easter or 6:29 PM on Christmas, so spectacular a violation of the laws of probability that it could only be explained as a miracle performed by an supernatural being, an all-knowing and all-powerful God. And since it occurred on Easter or Christmas, the miracle would prove the truth of Christianity, the the Christian God was the one true God and that Jesus was the son of God who was born of a virgin and resurrected after his death by crucifixion.
And God would have the atheists survive the heart-attacks or strokes to mortify them by compelling them to admit they’re wrong and that God exists and Christianity is true.
Atheism Simplified 