Because something is unbelievable, you should believe in it.
From The Australian an article on the end for God, which I thought was a good atheist piece until I got toward the end:
You’d have thought … that the Son of God … would enter the world in a way that would leave no doubt who he was or that he existed.
But he chose instead to come in a way that ensured just about the maximum room for doubt; …
That God would choose to come among us in such a way is so strange, so inexplicable, so unbelievable, it compels us to believe.
I would have thought that it would compel you to think it was all a load of rubbish, but hey, that’s just me.