So many people nowadays are abstract thinkers. They don't need evidence for their beliefs, just a little personal experience. I know someone who doesn't believe in God, but believes in spirits and fortune telling and in evolution.
In the UK evolution is something taught at school and is not mutually exclusive to belief in God and spirits. Concrete thinkers however, which all JWs are, and some continue to be once they wake up, need to have defined bounderies for their beliefs. Concrete thinking is very childlike and does not give a person the balance that is required as an adult.
Kate xx