Something to believe in is a concept that is often associated with religion, philosophy, and other belief systems. CREDO, DOGMA, CAUSE, creed, ISM, and TENET are all terms that can be used to describe something to believe in. CREDO is a Latin term meaning 'I believe' and is used to refer to a system of beliefs or principles. DOGMA is a set of beliefs or doctrines that are accepted as authoritative and not open to question. CAUSE is an idea or belief that is supported by a group of people. Creed is a statement of faith or belief. ISM is a suffix used to denote a particular doctrine, belief, or ideology. TENET is a principle, belief, or doctrine that is accepted as true and is often used to refer to religious beliefs.