The terms freethought and freethinkers are oxymorons. Freethinker is a pretentious moniker that atheists/agnostics have dubbed themselves (See: Atheism and arrogance).
There is no atheists/agnostics who are freethinkers. Jesus said, "He who sins is the slave of sin". See also: Atheism and morality and Moral failures of the atheist community
In addition, the atheist worldview has a number of beliefs that atheists commonly share (see: Atheism and beliefs).
Furthermore, most atheists fall on the left end of the political spectrum (see: Atheism and politics and Secular left).