I've prayed for God to stop letting babies have cancer. He ignored that.

A good education teaches students to have critical thinking skills and not to just believe things because the rest of the family/community does.
A good education can definitely remove religion from a person's life.
Of course people still have the choice of whether they want to be 'believers' on whatever they were brought up with, but education makes it obvious that you do have a choice and that the religion chosen by your parents is not the true one.
Also, the better read and researched a person is, the less likely that they will believe that there is truth in holy books.