suspend one's disbelief
To willingly accept the premise of a story or work of art, usually for the sake of enjoying it.
Although the novel was quite far-fetched, I was willing to suspend my disbelief.
noun
An unpreparedness, unwillingness, or an inability to believe that something is the case.
She cried out in disbelief on hearing that terrorists had crashed an airplane into the World Trade Center in New York City.
Astonishment.
I stared in disbelief at the Grand Canyon.
The loss or abandonment of a belief; the cessation of belief.
There is an agony of suffering in that lingering doubt which haunts the human soul in the beginnings of disbelief.
No adolescent can achieve disbelief in the stork without an eruption of young oaths and cynicisms.