Some bloggers, academics, and authors with books on Amazon seem to be confused about the verb believe and the noun belief. Here are just four examples:
INCORRECT: Manobo Religious Believes and Practices—title of paper published at Academia.edu.
CORRECT : Manobo Religious Beliefs and Practices
INCORRECT: A recent study examines how religious and spiritual believes can impact our health in different ways.—Science World Report.
CORRECT : A recent study examines how religious and spiritual beliefs can impact our health in different ways.
INCORRECT: Awakening of Religious Believes of Islam—Facebook page title.
CORRECT : Awakening of Religious Beliefs of Islam
INCORRECT: Why do I mention believes, I really mean religious believes, because more or less we have been forced to belief that a supernatural world doesn’t exist, or it is a world where only god’s reside.—Paul J. Linke, The Conspiracy Rhetoric of Mankind, Xlibris, 2012.
CORRECT : Why do I mention beliefs, I really mean religious beliefs, because more or less we have been forced to believe that a supernatural world doesn’t exist, or it is a world where only gods reside.
Believe is a verb. Its principal parts are believe/believes, believed, (has) believed.
Belief is a noun.
Paul Brians (Common Errors in English Usage) sums up the difference nicely:
People can’t have religious “believes”; they have religious beliefs. If you have it, it’s a belief; if you do it, you believe.