There is truth and then again there is truth. For all that the world is full of people who go around believing they've got you or your neighbor figured out, there really is no bottom to what is not known. The truth about us is endless. As are the lies.
Seeing is believing and believing is knowing and knowing beats unknowing and the unknown.
When I was a child... I was watching a snowstorm, and hopefully asked, 'Momma, do we believe in winter?'
When the whole world doesn't believe in God, it'll be a great place.