Actually they are different.
- Believe is a verb which is simply used for accepting the truth.
Example: He believes that all children are born with equal intelligence.
In above example the word believes
"believes" is used as a third-person singular simple present.
2. Belief is a noun which is generally used for acceptance/confidence in truth, faith or trust.
Example: I can't do that. It's against my beliefs.
In above example, the word beliefs
"beliefs" is used as plural of belief.
So, The difference is:
- Beliefs is the plural of a noun belief
- Believes is the use of a verb believe in third-person singular simple present