belief
/bə-ˈlēf/
noun
a state or habit of mind in which trust or confidence is placed in some person or thing
something that is accepted, considered to be true, or held as an opinion : something believed; especially : a tenet or body of tenets held by a group
conviction of the truth of some statement or the reality of some being or phenomenon especially when based on examination of evidence
her belief in God
idiom
—used to indicate that increasing number of people are coming to a particular belief
idiom
to be unbelievable or not deserving to be believed : to defy belief
It almost beggars belief that anyone can be so cruel.