free·think·er 
(frēthĭngkər)
(frēthĭngkər)n.
One who has rejected authority and dogma, especially in religious thinking, in favor of rational inquiry and speculation.
freethinking adj. & n.
- (John) Calvin
- John Casey.
- John Constantine
- John Cowdery
- John Crowe
- John Day River
- John Doe
- John Dory
- John Douglas
- J(ohn) Edgar
- John Edward
- John Ernst
- Johne's disease
- John Everett
- John Fitzgerald
- John Florence Sullivan.
- John Forbes
- John Foster
- John Franklin
- John French
- John George
- John Gerard
- John Glover, Jr.
- John Greenleaf
- John Griffith