Everyone believes in different things
The other word is beliefs which means - The feeling or confidence you have that something is real, true or worthwhile.
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The abstract noun is: beliefs
I just couldn't follow his radical beliefs.
their beliefs
He is pervicicacious in his beliefs.
He was am experienced Taoist.Taoist beliefs and practices are Chinese in origin.
Not all medieval beliefs have ceased to exist.
He was an ardent follower of gnostic beliefs and precepts.
He has very strong beliefs in god. Belief here means his devotion and true self.
Bias means your conclusions or beliefs are based on preconceived ideas.
Pertinaciously means holding tenatiously; resolutely. She held pertinaciously to her beliefs.
The seminar on spirituality was entirely antithetical to his christian beliefs.
Temperance is one of the strongest beliefs of the Quaker people.