I am not a free thinker. I don't believe in free will so i am not "free" to exchange one idea for another based purely on reason. I accept materialism essentially as a dogma upon which most of my other beliefs rely on.
Free thought is an invention of european philosophy, probably the 17th/18th century. It is a derivation of earlier Christian theology in which man- made in the image of god- possesses free will and is based on philosophical dualism of mind and body, the soul and the material and in which the individual is "free" to interpret Christian theology upon the basis of "reason" and not the authority of scripture. If there is no god- man cannot immitate god in having a soul or "free will".
In order for thought to be "free" in the metaphysical sense it must not be constrained by physical limitations such as our material interests, our emotions (in opposition to a "pure reason") as well as not being constrained by the physical processes of the brain and development of neurological connections. Think of it as if people's ideas evolve as neurons connect and there is "resistence" to new information because thinking is a physical process involving the brain- not a "pure" one existing in an abstract realm of pure thought or sensation. I have the power to change my ideas- but it has physical limitations. Its not eqivilent to a metaphysical conception of "freedom".
If you don't believe in a soul and therefore do not treat the mind as something seperate or independent from matter, thought is determined- not free.
The belief in Free thought and reason are secular hangovers of religious dogmas.
Down with Reason!